diff --git a/src/c2.c b/src/c2.c
index 567c655..cc9a97e 100644
--- a/src/c2.c
+++ b/src/c2.c
@@ -31,6 +31,7 @@
 #include "win.h"
 #include "c2.h"
 #include "string_utils.h"
+#include "utils.h"
 #include "log.h"
 
 #define C2_MAX_LEVELS 10
@@ -260,7 +261,7 @@ static inline c2_ptr_t
 c2h_comb_tree(c2_b_op_t op, c2_ptr_t p1, c2_ptr_t p2) {
  c2_ptr_t p = {
    .isbranch = true,
-   .b = malloc(sizeof(c2_b_t))
+   .b = cmalloc(c2_b_t)
  };
 
  p.b->opr1 = p1;
@@ -382,7 +383,7 @@ c2_parse(session_t *ps, c2_lptr_t **pcondlst, const char *pattern,
   // Insert to pcondlst
   {
     static const c2_lptr_t lptr_def = C2_LPTR_INIT;
-    c2_lptr_t *plptr = malloc(sizeof(c2_lptr_t));
+    auto plptr = cmalloc(c2_lptr_t);
     if (!plptr)
       printf_errfq(1, "(): Failed to allocate memory for new condition linked"
           " list element.");
@@ -609,7 +610,7 @@ static int
 c2_parse_target(session_t *ps, const char *pattern, int offset, c2_ptr_t *presult) {
   // Initialize leaf
   presult->isbranch = false;
-  presult->l = malloc(sizeof(c2_l_t));
+  presult->l = cmalloc(c2_l_t);
   if (!presult->l)
     c2_error("Failed to allocate memory for new leaf.");
 
@@ -918,7 +919,7 @@ c2_parse_pattern(session_t *ps, const char *pattern, int offset, c2_ptr_t *presu
     // We can't determine the length of the pattern, so we use the length
     // to the end of the pattern string -- currently escape sequences
     // cannot be converted to a string longer than itself.
-    char *tptnstr = malloc((strlen(pattern + offset) + 1) * sizeof(char));
+    auto tptnstr = ccalloc((strlen(pattern + offset) + 1), char);
     char *ptptnstr = tptnstr;
     pleaf->ptnstr = tptnstr;
     for (; pattern[offset] && delim != pattern[offset]; ++offset) {
@@ -1006,7 +1007,7 @@ c2_parse_legacy(session_t *ps, const char *pattern, int offset, c2_ptr_t *presul
     c2_error("Legacy parser: Invalid format.");
 
   // Allocate memory for new leaf
-  c2_l_t *pleaf = malloc(sizeof(c2_l_t));
+  auto pleaf = cmalloc(c2_l_t);
   if (!pleaf)
     printf_errfq(1, "(): Failed to allocate memory for new leaf.");
   presult->isbranch = false;
@@ -1096,7 +1097,7 @@ c2_l_postprocess(session_t *ps, c2_l_t *pleaf) {
       }
     }
     if (!found) {
-      latom_t *pnew = malloc(sizeof(latom_t));
+      auto pnew = cmalloc(latom_t);
       if (!pnew)
         printf_errfq(1, "(): Failed to allocate memory for new track atom.");
       pnew->next = ps->track_atom_lst;
diff --git a/src/common.h b/src/common.h
index 83e1233..26d0e87 100644
--- a/src/common.h
+++ b/src/common.h
@@ -142,6 +142,8 @@
 #include "x.h"
 #include "region.h"
 #include "log.h"
+#include "utils.h"
+#include "compiler.h"
 
 // === Constants ===
 
@@ -1380,7 +1382,7 @@ set_ignore(session_t *ps, unsigned long sequence) {
   if (ps->o.show_all_xerrors)
     return;
 
-  ignore_t *i = malloc(sizeof(ignore_t));
+  auto i = cmalloc(ignore_t);
   if (!i) return;
 
   i->sequence = sequence;
@@ -1545,8 +1547,8 @@ glx_mark_(session_t *ps, const char *func, XID xid, bool start) {
   if (glx_has_context(ps) && ps->psglx->glStringMarkerGREMEDY) {
     if (!func) func = "(unknown)";
     const char *postfix = (start ? " (start)": " (end)");
-    char *str = malloc((strlen(func) + 12 + 2
-          + strlen(postfix) + 5) * sizeof(char));
+    auto str = ccalloc((strlen(func) + 12 + 2
+      + strlen(postfix) + 5), char);
     strcpy(str, func);
     sprintf(str + strlen(str), "(%#010lx)%s", xid, postfix);
     ps->psglx->glStringMarkerGREMEDY(strlen(str), str);
diff --git a/src/compiler.h b/src/compiler.h
new file mode 100644
index 0000000..2a2060d
--- /dev/null
+++ b/src/compiler.h
@@ -0,0 +1,4 @@
+// SPDX-License-Identifier: MPL-2.0
+// Copyright (c) 2018 Yuxuan Shui <yshuiv7@gmail.com>
+#pragma once
+#define auto __auto_type
diff --git a/src/compton.c b/src/compton.c
index d702b95..f5a0ced 100644
--- a/src/compton.c
+++ b/src/compton.c
@@ -21,6 +21,7 @@
 
 #include <ev.h>
 
+#include "compiler.h"
 #include "compton.h"
 #ifdef CONFIG_OPENGL
 #include "opengl.h"
@@ -30,6 +31,7 @@
 #include "config.h"
 #include "diagnostic.h"
 #include "string_utils.h"
+#include "utils.h"
 #include "log.h"
 
 #define auto __auto_type
@@ -289,7 +291,7 @@ resize_region(session_t *ps, region_t *region, short mod) {
   int nrects;
   int nnewrects = 0;
   pixman_box32_t *rects = pixman_region32_rectangles(region, &nrects);
-  pixman_box32_t *newrects = calloc(nrects, sizeof *newrects);
+  auto newrects = ccalloc(nrects, pixman_box32_t);
   for (int i = 0; i < nrects; i++) {
     int x1 = max_i(rects[i].x1 - mod, 0);
     int y1 = max_i(rects[i].y1 - mod, 0);
@@ -384,8 +386,7 @@ cxinerama_upd_scrs(session_t *ps) {
   xcb_xinerama_screen_info_t *scrs = xcb_xinerama_query_screens_screen_info(ps->xinerama_scrs);
   ps->xinerama_nscrs = xcb_xinerama_query_screens_screen_info_length(ps->xinerama_scrs);
 
-  ps->xinerama_scr_regs = allocchk(malloc(sizeof(region_t)
-        * ps->xinerama_nscrs));
+  ps->xinerama_scr_regs = ccalloc(ps->xinerama_nscrs, region_t);
   for (int i = 0; i < ps->xinerama_nscrs; ++i) {
     const xcb_xinerama_screen_info_t * const s = &scrs[i];
     pixman_region32_init_rect(&ps->xinerama_scr_regs[i], s->x_org, s->y_org, s->width, s->height);
@@ -583,7 +584,7 @@ make_gaussian_map(double r) {
   int center = size/2;
   double t;
 
-  c = malloc(sizeof(conv)+size*size*sizeof(double));
+  c = cvalloc(sizeof(conv)+size*size*sizeof(double));
   c->size = size;
   t = 0.0;
 
@@ -691,8 +692,8 @@ presum_gaussian(session_t *ps, conv *map) {
   if (ps->shadow_top)
     free(ps->shadow_top);
 
-  ps->shadow_corner = malloc((ps->cgsize + 1) * (ps->cgsize + 1) * 26);
-  ps->shadow_top = malloc((ps->cgsize + 1) * 26);
+  ps->shadow_corner = cvalloc((ps->cgsize + 1) * (ps->cgsize + 1) * 26);
+  ps->shadow_top = cvalloc((ps->cgsize + 1) * 26);
 
   for (x = 0; x <= ps->cgsize; x++) {
     ps->shadow_top[25 * (ps->cgsize + 1) + x] =
@@ -1531,7 +1532,7 @@ win_blur_background(session_t *ps, win *w, xcb_render_picture_t tgt_buffer,
 
           // Allocate cache space if needed
           if (!kern_dst) {
-            kern_dst = malloc((kwid * khei + 2) * sizeof(xcb_render_fixed_t));
+            kern_dst = ccalloc(kwid * khei + 2, xcb_render_fixed_t);
             if (!kern_dst) {
               printf_errf("(): Failed to allocate memory for blur kernel.");
               return;
@@ -2935,11 +2936,10 @@ ev_expose(session_t *ps, xcb_expose_event_t *ev) {
     int more = ev->count + 1;
     if (ps->n_expose == ps->size_expose) {
       if (ps->expose_rects) {
-        ps->expose_rects = realloc(ps->expose_rects,
-          (ps->size_expose + more) * sizeof(rect_t));
+        ps->expose_rects = crealloc(ps->expose_rects, ps->size_expose + more);
         ps->size_expose += more;
       } else {
-        ps->expose_rects = malloc(more * sizeof(rect_t));
+        ps->expose_rects = ccalloc(more, rect_t);
         ps->size_expose = more;
       }
     }
@@ -3719,7 +3719,7 @@ register_cm(session_t *ps) {
       s /= 10;
     }
 
-    char *buf = malloc(len);
+    auto buf = ccalloc(len, char);
     snprintf(buf, len, REGISTER_PROP "%d", ps->scr);
     buf[len - 1] = '\0';
     atom = get_atom(ps, buf);
@@ -4281,12 +4281,8 @@ get_cfg(session_t *ps, int argc, char *const *argv, bool first_pass) {
       DOUBLE_TO_XFIXED(1), DOUBLE_TO_XFIXED(1), DOUBLE_TO_XFIXED(1),
       DOUBLE_TO_XFIXED(1), DOUBLE_TO_XFIXED(1), DOUBLE_TO_XFIXED(1),
     };
-    ps->o.blur_kerns[0] = malloc(sizeof(convolution_blur));
-    if (!ps->o.blur_kerns[0]) {
-      printf_errf("(): Failed to allocate memory for convolution kernel.");
-      exit(1);
-    }
-    memcpy(ps->o.blur_kerns[0], &convolution_blur, sizeof(convolution_blur));
+    ps->o.blur_kerns[0] = ccalloc(ARR_SIZE(convolution_blur), xcb_render_fixed_t);
+    memcpy(ps->o.blur_kerns[0], convolution_blur, sizeof(convolution_blur));
   }
 
   rebuild_shadow_exclude_reg(ps);
@@ -4671,7 +4667,7 @@ vsync_deinit(session_t *ps) {
  */
 static void
 init_alpha_picts(session_t *ps) {
-  ps->alpha_picts = malloc(sizeof(xcb_render_picture_t) * (MAX_ALPHA+1));
+  ps->alpha_picts = ccalloc(MAX_ALPHA+1, xcb_render_picture_t);
 
   for (int i = 0; i <= MAX_ALPHA; ++i) {
     double o = (double) i / MAX_ALPHA;
@@ -5187,7 +5183,7 @@ session_init(session_t *ps_old, int argc, char **argv) {
   };
 
   // Allocate a session and copy default values into it
-  session_t *ps = malloc(sizeof(session_t));
+  session_t *ps = cmalloc(session_t);
   *ps = s_def;
   ps->loop = EV_DEFAULT;
   pixman_region32_init(&ps->screen_reg);
diff --git a/src/config.c b/src/config.c
index e64180b..9958388 100644
--- a/src/config.c
+++ b/src/config.c
@@ -5,6 +5,7 @@
 #include <stdlib.h>
 #include <stdbool.h>
 
+#include "compiler.h"
 #include "common.h"
 #include "utils.h"
 #include "c2.h"
@@ -61,17 +62,16 @@ xcb_render_fixed_t *
 parse_matrix(session_t *ps, const char *src, const char **endptr) {
   int wid = 0, hei = 0;
   const char *pc = NULL;
-  xcb_render_fixed_t *matrix = NULL;
 
   // Get matrix width and height
   {
     double val = 0.0;
     if (src == (pc = parse_matrix_readnum(src, &val)))
-      goto parse_matrix_err;
+      goto err1;
     src = pc;
     wid = val;
     if (src == (pc = parse_matrix_readnum(src, &val)))
-      goto parse_matrix_err;
+      goto err1;
     src = pc;
     hei = val;
   }
@@ -79,21 +79,21 @@ parse_matrix(session_t *ps, const char *src, const char **endptr) {
   // Validate matrix width and height
   if (wid <= 0 || hei <= 0) {
     printf_errf("(): Invalid matrix width/height.");
-    goto parse_matrix_err;
+    goto err1;
   }
   if (!(wid % 2 && hei % 2)) {
     printf_errf("(): Width/height not odd.");
-    goto parse_matrix_err;
+    goto err1;
   }
   if (wid > 16 || hei > 16)
     printf_errf("(): Matrix width/height too large, may slow down"
                 "rendering, and/or consume lots of memory");
 
   // Allocate memory
-  matrix = calloc(wid * hei + 2, sizeof(xcb_render_fixed_t));
+  auto matrix = ccalloc(wid * hei + 2, xcb_render_fixed_t);
   if (!matrix) {
     printf_errf("(): Failed to allocate memory for matrix.");
-    goto parse_matrix_err;
+    goto err1;
   }
 
   // Read elements
@@ -108,7 +108,7 @@ parse_matrix(session_t *ps, const char *src, const char **endptr) {
       }
       double val = 0;
       if (src == (pc = parse_matrix_readnum(src, &val)))
-        goto parse_matrix_err;
+        goto err2;
       src = pc;
       if (val < 0) hasneg = true;
       matrix[2 + i] = DOUBLE_TO_XFIXED(val);
@@ -122,7 +122,7 @@ parse_matrix(session_t *ps, const char *src, const char **endptr) {
   for ( ;*pc && ';' != *pc; ++pc)
     if (!isspace(*pc) && ',' != *pc) {
       printf_errf("(): Trailing characters in matrix string.");
-      goto parse_matrix_err;
+      goto err2;
     }
 
   // Jump over spaces after ';'
@@ -138,7 +138,7 @@ parse_matrix(session_t *ps, const char *src, const char **endptr) {
     *endptr = pc;
   else if (*pc) {
     printf_errf("(): Only one matrix expected.");
-    goto parse_matrix_err;
+    goto err2;
   }
 
   // Fill in width and height
@@ -147,8 +147,9 @@ parse_matrix(session_t *ps, const char *src, const char **endptr) {
 
   return matrix;
 
-parse_matrix_err:
+err2:
   free(matrix);
+err1:
   return NULL;
 }
 
diff --git a/src/dbus.c b/src/dbus.c
index b1085dc..2cb9418 100644
--- a/src/dbus.c
+++ b/src/dbus.c
@@ -9,6 +9,7 @@
  *
  */
 
+#include "compiler.h"
 #include "win.h"
 #include "string_utils.h"
 #include "log.h"
@@ -164,7 +165,7 @@ static dbus_bool_t
 cdbus_callback_add_timeout(DBusTimeout *timeout, void *data) {
   session_t *ps = data;
 
-  ev_dbus_timer *t = calloc(1, sizeof *t);
+  auto t = ccalloc(1, ev_dbus_timer);
   double i = dbus_timeout_get_interval(timeout) / 1000.0;
   ev_timer_init(&t->w, cdbus_callback_handle_timeout, i, i);
   t->t = timeout;
@@ -251,7 +252,7 @@ static dbus_bool_t
 cdbus_callback_add_watch(DBusWatch *watch, void *data) {
   session_t *ps = data;
 
-  ev_dbus_io *w = calloc(1, sizeof *w);
+  auto w = ccalloc(1, ev_dbus_io);
   w->dw = watch;
   w->ps = ps;
   ev_io_init(&w->w, cdbus_io_callback, dbus_watch_get_unix_fd(watch),
@@ -420,7 +421,7 @@ cdbus_apdarg_wids(session_t *ps, DBusMessage *msg, const void *data) {
   }
 
   // Allocate memory for an array of window IDs
-  cdbus_window_t *arr = malloc(sizeof(cdbus_window_t) * count);
+  auto arr = ccalloc(count, cdbus_window_t);
   if (!arr) {
     printf_errf("(): Failed to allocate memory for window ID array.");
     return false;
diff --git a/src/opengl.c b/src/opengl.c
index 664da29..523ca85 100644
--- a/src/opengl.c
+++ b/src/opengl.c
@@ -9,6 +9,7 @@
  *
  */
 
+#include "compiler.h"
 #include "string_utils.h"
 #include "log.h"
 
@@ -77,8 +78,7 @@ glx_update_fbconfig_bydepth(session_t *ps, int depth, glx_fbconfig_t *pfbcfg) {
     printf_dbgf("(%d): %#x overrides %#x, target %#x.\n", depth, (unsigned) pfbcfg->cfg, (ps->psglx->fbconfigs[depth] ? (unsigned) ps->psglx->fbconfigs[depth]->cfg: 0), pfbcfg->texture_tgts);
 #endif
     if (!ps->psglx->fbconfigs[depth]) {
-      ps->psglx->fbconfigs[depth] = malloc(sizeof(glx_fbconfig_t));
-      allocchk(ps->psglx->fbconfigs[depth]);
+      ps->psglx->fbconfigs[depth] = cmalloc(glx_fbconfig_t);
     }
     (*ps->psglx->fbconfigs[depth]) = *pfbcfg;
   }
@@ -260,7 +260,7 @@ glx_init(session_t *ps, bool need_render) {
   // Initialize GLX data structure
   if (!ps->psglx) {
     static const glx_session_t CGLX_SESSION_DEF = CGLX_SESSION_INIT;
-    ps->psglx = cmalloc(1, glx_session_t);
+    ps->psglx = cmalloc(glx_session_t);
     memcpy(ps->psglx, &CGLX_SESSION_DEF, sizeof(glx_session_t));
 
     for (int i = 0; i < MAX_BLUR_PASS; ++i) {
@@ -571,7 +571,7 @@ glx_init_blur(session_t *ps) {
                            (strlen(shader_add) + strlen(texture_func) + 42) * nele +
                            strlen(FRAG_SHADER_BLUR_SUFFIX) +
                            strlen(texture_func) + 12 + 1;
-        char *shader_str = calloc(len, sizeof(char));
+        char *shader_str = ccalloc(len, char);
         if (!shader_str) {
           printf_errf("(): Failed to allocate %d bytes for shader string.", len);
           return false;
@@ -708,7 +708,7 @@ glx_bind_pixmap(session_t *ps, glx_texture_t **pptex, xcb_pixmap_t pixmap,
       .y_inverted = false,
     };
 
-    ptex = malloc(sizeof(glx_texture_t));
+    ptex = cmalloc(glx_texture_t);
     allocchk(ptex);
     memcpy(ptex, &GLX_TEX_DEF, sizeof(glx_texture_t));
     *pptex = ptex;
@@ -1457,7 +1457,7 @@ glx_take_screenshot(session_t *ps, int *out_length) {
   glGetIntegerv(GL_UNPACK_ALIGNMENT, &unpack_align_old);
   assert(unpack_align_old > 0);
   glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
-  unsigned char *buf = cmalloc(length, unsigned char);
+  auto buf = ccalloc(length, unsigned char);
   glReadBuffer(GL_FRONT);
   glReadPixels(0, 0, ps->root_width, ps->root_height, GL_RGB,
       GL_UNSIGNED_BYTE, buf);
diff --git a/src/string_utils.c b/src/string_utils.c
index ad2dbde..0ce451a 100644
--- a/src/string_utils.c
+++ b/src/string_utils.c
@@ -1,12 +1,13 @@
 #include <string.h>
 
+#include "compiler.h"
 #include "string_utils.h"
 #include "utils.h"
 /**
  * Allocate the space and copy a string.
  */
 char *mstrcpy(const char *src) {
-  char *str = cmalloc(strlen(src) + 1, char);
+  auto str = ccalloc(strlen(src) + 1, char);
 
   strcpy(str, src);
 
@@ -17,7 +18,7 @@ char *mstrcpy(const char *src) {
  * Allocate the space and copy a string.
  */
 char *mstrncpy(const char *src, unsigned len) {
-  char *str = cmalloc(len + 1, char);
+  auto str = ccalloc(len + 1, char);
 
   strncpy(str, src, len);
   str[len] = '\0';
@@ -29,7 +30,7 @@ char *mstrncpy(const char *src, unsigned len) {
  * Allocate the space and join two strings.
  */
 char *mstrjoin(const char *src1, const char *src2) {
-  char *str = cmalloc(strlen(src1) + strlen(src2) + 1, char);
+  auto str = ccalloc(strlen(src1)+strlen(src2)+1, char);
 
   strcpy(str, src1);
   strcat(str, src2);
@@ -42,8 +43,7 @@ char *mstrjoin(const char *src1, const char *src2) {
  */
 char *
 mstrjoin3(const char *src1, const char *src2, const char *src3) {
-  char *str = cmalloc(strlen(src1) + strlen(src2)
-        + strlen(src3) + 1, char);
+  auto str = ccalloc(strlen(src1)+strlen(src2)+strlen(src3)+1, char);
 
   strcpy(str, src1);
   strcat(str, src2);
@@ -56,8 +56,7 @@ mstrjoin3(const char *src1, const char *src2, const char *src3) {
  * Concatenate a string on heap with another string.
  */
 void mstrextend(char **psrc1, const char *src2) {
-  *psrc1 = crealloc(*psrc1, (*psrc1 ? strlen(*psrc1): 0) + strlen(src2) + 1,
-      char);
+  *psrc1 = crealloc(*psrc1, (*psrc1 ? strlen(*psrc1) : 0)+strlen(src2)+1);
 
   strcat(*psrc1, src2);
 }
diff --git a/src/utils.h b/src/utils.h
index 15ee5ed..db48502 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -119,13 +119,17 @@ allocchk_(const char *func_name, void *ptr) {
 #define allocchk(ptr) allocchk_(__func__, ptr)
 
 /// @brief Wrapper of malloc().
-#define cmalloc(nmemb, type) ((type *) allocchk(malloc((nmemb) * sizeof(type))))
+#define cmalloc(type) ((type *) allocchk(malloc(sizeof(type))))
+
+/// @brief Wrapper of malloc() that takes a size
+#define cvalloc(size) allocchk(malloc(size))
 
 /// @brief Wrapper of calloc().
 #define ccalloc(nmemb, type) ((type *) allocchk(calloc((nmemb), sizeof(type))))
 
 /// @brief Wrapper of ealloc().
-#define crealloc(ptr, nmemb, type) ((type *) allocchk(realloc((ptr), (nmemb) * sizeof(type))))
+#define crealloc(ptr, nmemb) \
+  ((__typeof__(ptr)) allocchk(realloc((ptr), (nmemb) * sizeof(*(ptr)))))
 
 /// RC_TYPE generates a reference counted type from `type`
 ///
@@ -152,7 +156,7 @@ typedef struct { \
 } name##_internal_t; \
 typedef type name##_t; \
 Q type *name##_new(void) { \
-  name##_internal_t *ret = malloc(sizeof(name##_internal_t)); \
+  name##_internal_t *ret = cmalloc(name##_internal_t); \
   ctor((type *)ret); \
   ret->ref_count = 1; \
   return (type *)ret; \
diff --git a/src/win.c b/src/win.c
index a019df1..0245d98 100644
--- a/src/win.c
+++ b/src/win.c
@@ -8,11 +8,13 @@
 #include <stdbool.h>
 #include <math.h>
 
+#include "compiler.h"
 #include "common.h"
 #include "compton.h"
 #include "c2.h"
 #include "x.h"
 #include "string_utils.h"
+#include "utils.h"
 #include "log.h"
 
 #include "win.h"
@@ -813,7 +815,7 @@ bool add_win(session_t *ps, Window id, Window prev) {
   }
 
   // Allocate and initialize the new win structure
-  win *new = malloc(sizeof(win));
+  auto new = cmalloc(win);
 
 #ifdef DEBUG_EVENTS
   printf_dbgf("(%#010lx): %p\n", id, new);
diff --git a/src/x.c b/src/x.c
index 157bc21..47f17a1 100644
--- a/src/x.c
+++ b/src/x.c
@@ -8,6 +8,7 @@
 #include <xcb/xfixes.h>
 #include <pixman.h>
 
+#include "compiler.h"
 #include "common.h"
 #include "x.h"
 #include "log.h"
@@ -223,7 +224,7 @@ bool x_fetch_region(session_t *ps, xcb_xfixes_region_t r, pixman_region32_t *res
   }
 
   int nrect = xcb_xfixes_fetch_region_rectangles_length(xr);
-  pixman_box32_t *b = calloc(nrect, sizeof *b);
+  auto b = ccalloc(nrect, pixman_box32_t);
   xcb_rectangle_t *xrect = xcb_xfixes_fetch_region_rectangles(xr);
   for (int i = 0; i < nrect; i++) {
     b[i] = (pixman_box32_t) {
@@ -243,7 +244,7 @@ void x_set_picture_clip_region(session_t *ps, xcb_render_picture_t pict,
     int clip_x_origin, int clip_y_origin, const region_t *reg) {
   int nrects;
   const rect_t *rects = pixman_region32_rectangles((region_t *)reg, &nrects);
-  xcb_rectangle_t *xrects = calloc(nrects, sizeof *xrects);
+  auto xrects = ccalloc(nrects, xcb_rectangle_t);
   for (int i = 0; i < nrects; i++)
     xrects[i] = (xcb_rectangle_t){
       .x = rects[i].x1,
diff --git a/src/xrescheck.c b/src/xrescheck.c
index 5a5ec6b..917bb0b 100644
--- a/src/xrescheck.c
+++ b/src/xrescheck.c
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: MIT
 // Copyright (c) 2014 Richard Grenville <pyxlcy@gmail.com>
 
+#include "compiler.h"
 #include "log.h"
 
 #include "xrescheck.h"
@@ -23,7 +24,7 @@ static xrc_xid_record_t *gs_xid_records = NULL;
  */
 void
 xrc_add_xid_(XID xid, const char *type, M_POS_DATA_PARAMS) {
-  xrc_xid_record_t *prec = cmalloc(1, xrc_xid_record_t);
+  auto prec = ccalloc(1, xrc_xid_record_t);
   prec->xid = xid;
   prec->type = type;
   M_CPY_POS_DATA(prec);