diff --git a/src/compton.c b/src/compton.c
index 87d1611..5a1d7aa 100644
--- a/src/compton.c
+++ b/src/compton.c
@@ -1134,7 +1134,7 @@ paint_preprocess(session_t *ps, win *list) {
       if (w->frame_opacity == 1)
         *tmp = win_get_bounding_shape_global_by_val(w);
       else {
-        win_get_region_noframe_local(ps, w, tmp);
+        win_get_region_noframe_local(w, tmp);
         pixman_region32_intersect(tmp, tmp, &w->bounding_shape);
         pixman_region32_translate(tmp, w->g.x, w->g.y);
       }
@@ -1378,7 +1378,7 @@ win_blur_background(session_t *ps, win *w, xcb_render_picture_t tgt_buffer,
         if (win_is_solid(ps, w)) {
           region_t reg_noframe;
           pixman_region32_init(&reg_noframe);
-          win_get_region_noframe_local(ps, w, &reg_noframe);
+          win_get_region_noframe_local(w, &reg_noframe);
           pixman_region32_translate(&reg_noframe, w->g.x, w->g.y);
           pixman_region32_subtract(&reg_blur, &reg_blur, &reg_noframe);
           pixman_region32_fini(&reg_noframe);
@@ -1521,7 +1521,7 @@ paint_one(session_t *ps, win *w, const region_t *reg_paint) {
     paint_region(ps, w, 0, 0, wid, hei, dopacity, reg_paint, pict);
   } else {
     // Painting parameters
-    const margin_t extents = win_calc_frame_extents(ps, w);
+    const margin_t extents = win_calc_frame_extents(w);
     const int t = extents.top;
     const int l = extents.left;
     const int b = extents.bottom;
diff --git a/src/win.c b/src/win.c
index ab205f2..6ba9fd6 100644
--- a/src/win.c
+++ b/src/win.c
@@ -19,7 +19,7 @@
 /// Generate a "return by value" function, from a function that returns the
 /// region via a region_t pointer argument.
 /// Function signature has to be (win *, region_t *)
-#define gen_by_val(fun) void region_t fun##_by_val(win *w) { \
+#define gen_by_val(fun) region_t fun##_by_val(win *w) { \
   region_t ret; \
   pixman_region32_init(&ret); \
   fun(w, &ret); \
@@ -97,8 +97,8 @@ static void win_get_region_local(session_t *ps, win *w, region_t *res) {
 /**
  * Get a rectangular region a window occupies, excluding frame and shadow.
  */
-void win_get_region_noframe_local(session_t *ps, win *w, region_t *res) {
-  const margin_t extents = win_calc_frame_extents(ps, w);
+void win_get_region_noframe_local(win *w, region_t *res) {
+  const margin_t extents = win_calc_frame_extents(w);
 
   int x = extents.left;
   int y = extents.top;
diff --git a/src/win.h b/src/win.h
index 63b8df4..5e8b835 100644
--- a/src/win.h
+++ b/src/win.h
@@ -329,7 +329,7 @@ void add_damage_from_win(session_t *ps, win *w);
  *
  * Return region in global coordinates.
  */
-void win_get_region_noframe_local(session_t *ps, win *w, region_t *);
+void win_get_region_noframe_local(win *w, region_t *);
 /**
  * Retrieve frame extents from a window.
  */
@@ -367,7 +367,7 @@ win_get_bounding_shape_global_by_val(win *w) {
  * _NET_FRAME_EXTENTS and the X window border width.
  */
 static inline margin_t __attribute__((pure))
-win_calc_frame_extents(session_t *ps, const win *w) {
+win_calc_frame_extents(const win *w) {
   margin_t result = w->frame_extents;
   result.top = max_i(result.top, w->g.border_width);
   result.left = max_i(result.left, w->g.border_width);