diff --git a/src/common.h b/src/common.h
index 2b75ff7..52c3ac7 100644
--- a/src/common.h
+++ b/src/common.h
@@ -2402,7 +2402,7 @@ xr_sync_(session_t *ps, Drawable d
     if (!*pfence)
       *pfence = XSyncCreateFence(ps->dpy, d, False);
     if (*pfence) {
-      Bool triggered = False;
+      Bool __attribute__((unused)) triggered = False;
       /* if (XSyncQueryFence(ps->dpy, *pfence, &triggered) && triggered)
         XSyncResetFence(ps->dpy, *pfence); */
       // The fence may fail to be created (e.g. because of died drawable)
diff --git a/src/compton.c b/src/compton.c
index 6af3403..7a16951 100644
--- a/src/compton.c
+++ b/src/compton.c
@@ -1722,6 +1722,8 @@ win_paint_win(session_t *ps, win *w, XserverRegion reg_paint,
             reg_paint, pcache_reg);
         break;
 #endif
+      default:
+        assert(false);
     }
   }
 
@@ -2666,29 +2668,6 @@ win_on_factor_change(session_t *ps, win *w) {
         ps->o.unredir_if_possible_blacklist, &w->cache_uipblst);
 }
 
-/**
- * Process needed window updates.
- */
-static void
-win_upd_run(session_t *ps, win *w, win_upd_t *pupd) {
-  if (pupd->shadow) {
-    win_determine_shadow(ps, w);
-    pupd->shadow = false;
-  }
-  if (pupd->fade) {
-    win_determine_fade(ps, w);
-    pupd->fade = false;
-  }
-  if (pupd->invert_color) {
-    win_determine_invert_color(ps, w);
-    pupd->invert_color = false;
-  }
-  if (pupd->focus) {
-    win_update_focused(ps, w);
-    pupd->focus = false;
-  }
-}
-
 /**
  * Update cache data in struct _win that depends on window size.
  */
@@ -3444,8 +3423,6 @@ wid_get_prop_window(session_t *ps, Window wid, Atom aprop) {
  */
 static void
 win_update_focused(session_t *ps, win *w) {
-  bool focused_old = w->focused;
-
   if (UNSET != w->focused_force) {
     w->focused = w->focused_force;
   }
@@ -6622,6 +6599,8 @@ init_filters(session_t *ps) {
             return false;
         }
 #endif
+      default:
+        assert(false);
     }
   }
 
diff --git a/src/compton.h b/src/compton.h
index 24ef2d5..5acb9bc 100644
--- a/src/compton.h
+++ b/src/compton.h
@@ -733,6 +733,8 @@ set_tgt_clip(session_t *ps, XserverRegion reg, const reg_data_t *pcache_reg) {
       glx_set_clip(ps, reg, pcache_reg);
       break;
 #endif
+    default:
+      assert(false);
   }
 }
 
@@ -885,9 +887,6 @@ win_on_wtype_change(session_t *ps, win *w);
 static void
 win_on_factor_change(session_t *ps, win *w);
 
-static void
-win_upd_run(session_t *ps, win *w, win_upd_t *pupd);
-
 static void
 calc_win_size(session_t *ps, win *w);
 
diff --git a/src/dbus.h b/src/dbus.h
index a806c2d..b924a5e 100644
--- a/src/dbus.h
+++ b/src/dbus.h
@@ -25,7 +25,7 @@
 #define CDBUS_ERROR_BADARG      CDBUS_ERROR_PREFIX ".bad_argument"
 #define CDBUS_ERROR_BADARG_S    "Failed to parse argument %d: %s"
 #define CDBUS_ERROR_BADWIN      CDBUS_ERROR_PREFIX ".bad_window"
-#define CDBUS_ERROR_BADWIN_S    "Requested window %#010lx not found."
+#define CDBUS_ERROR_BADWIN_S    "Requested window %#010x not found."
 #define CDBUS_ERROR_BADTGT      CDBUS_ERROR_PREFIX ".bad_target"
 #define CDBUS_ERROR_BADTGT_S    "Target \"%s\" not found."
 #define CDBUS_ERROR_FORBIDDEN   CDBUS_ERROR_PREFIX ".forbidden"
diff --git a/src/opengl.c b/src/opengl.c
index 3a84c98..3707b14 100644
--- a/src/opengl.c
+++ b/src/opengl.c
@@ -1660,8 +1660,10 @@ glx_render_(session_t *ps, const glx_texture_t *ptex,
 
 /**
  * Render a region with color.
+ *
+ * Unused but can be useful for debugging
  */
-static void
+static void __attribute__((unused))
 glx_render_color(session_t *ps, int dx, int dy, int width, int height, int z,
     XserverRegion reg_tgt, const reg_data_t *pcache_reg) {
   static int color = 0;
@@ -1696,8 +1698,10 @@ glx_render_color(session_t *ps, int dx, int dy, int width, int height, int z,
 
 /**
  * Render a region with dots.
+ *
+ * Unused but can be useful for debugging
  */
-static void
+static void __attribute__((unused))
 glx_render_dots(session_t *ps, int dx, int dy, int width, int height, int z,
     XserverRegion reg_tgt, const reg_data_t *pcache_reg) {
   glColor4f(0.0f, 0.0f, 0.0f, 1.0f);