diff --git a/src/backend/wayland/wl_framebuf.c b/src/backend/wayland/wl_framebuf.c
index 4223ffb..39c523d 100644
--- a/src/backend/wayland/wl_framebuf.c
+++ b/src/backend/wayland/wl_framebuf.c
@@ -911,9 +911,12 @@ wl_frame_paint_button(WCoreWindow *button, WTexture *texture,
     if (!icon)
         return;
 
+    struct wl_frame_buf *parent_fb = frame_buf_find(fwin->core->window);
     struct wl_frame_buf *tb_fb = fwin->titlebar ? frame_buf_find(fwin->titlebar->window) : NULL;
     uint32_t bg_pixel = 0xFF333333;
-    if (tb_fb && tb_fb->image) {
+    /* Sample button background from the titlebar buffer, or from the
+     * parent frame buffer if the titlebar was rendered there (fallback). */
+    if (tb_fb && tb_fb->image && tb_fb->width >= btn_fb->rel_x + bw) {
         uint32_t *tb_data = pixman_image_get_data(tb_fb->image);
         int tb_stride = pixman_image_get_stride(tb_fb->image) / 4;
         int sample_y = btn_fb->rel_y + bh / 2;
@@ -921,6 +924,14 @@ wl_frame_paint_button(WCoreWindow *button, WTexture *texture,
         if (sample_y >= 0 && sample_y < tb_fb->height &&
             sample_x >= 0 && sample_x < tb_fb->width)
             bg_pixel = tb_data[sample_y * tb_stride + sample_x];
+    } else if (parent_fb && parent_fb->image) {
+        uint32_t *p_data = pixman_image_get_data(parent_fb->image);
+        int p_stride = pixman_image_get_stride(parent_fb->image) / 4;
+        int sample_y = btn_fb->rel_y + bh / 2;
+        int sample_x = btn_fb->rel_x + bw / 2;
+        if (sample_y >= 0 && sample_y < parent_fb->height &&
+            sample_x >= 0 && sample_x < parent_fb->width)
+            bg_pixel = p_data[sample_y * p_stride + sample_x];
     }
 
     uint32_t fg_pixel = 0xFF000000 | ((color >> 16 & 0xFF) << 16) |