diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 22db51d..4ab866e 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -122,7 +122,8 @@
  * using the DRM_DEBUG_KMS and DRM_DEBUG.
  */
 
-extern void drm_ut_debug_printk(unsigned int request_level,
+extern __attribute__((format (printf, 4, 5)))
+void drm_ut_debug_printk(unsigned int request_level,
 				const char *prefix,
 				const char *function_name,
 				const char *format, ...);