diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
index 7e75fa053473..a8e8db024980 100644
--- a/include/drm/ttm/ttm_bo_driver.h
+++ b/include/drm/ttm/ttm_bo_driver.h
@@ -42,7 +42,7 @@
 #include <linux/spinlock.h>
 #include <linux/reservation.h>
 
-#define TTM_MAX_BO_PRIORITY	16
+#define TTM_MAX_BO_PRIORITY	16U
 
 struct ttm_backend_func {
 	/**