diff --git a/src/backend/wayland/wl_backend.c b/src/backend/wayland/wl_backend.c
index ac99a42..cab478e 100644
--- a/src/backend/wayland/wl_backend.c
+++ b/src/backend/wayland/wl_backend.c
@@ -130,6 +130,7 @@
 #include <wlr/types/wlr_scene.h>       /* Phase 18: scene graph compositing */
 #include <wlr/render/allocator.h>      /* Phase 18: buffer allocator */
 #include <wlr/types/wlr_buffer.h>      /* Phase 29+: WM-owned SHM surface buffers */
+#include <libdrm/drm_fourcc.h>        /* Phase 29+: DRM_FORMAT_ARGB8888 */
 #include <pixman.h>                    /* Phase 29+: software pixel rendering */
 #include <wlr/types/wlr_cursor.h>      /* Phase 23: hardware cursor tracking */
 #include <wlr/types/wlr_xcursor_manager.h> /* Phase 23: xcursor theme */
@@ -2421,7 +2422,7 @@ shm_buf_begin_data_ptr(struct wlr_buffer *buf, uint32_t flags,
     struct wm_shm_surface *s = wl_container_of(buf, s, wlr_buf);
     (void)flags;
     *out_data   = s->data;
-    *out_fmt    = WL_SHM_FORMAT_ARGB8888;
+    *out_fmt    = DRM_FORMAT_ARGB8888;
     *out_stride = s->stride;
     return true;
 }