diff --git a/linux-core/drmP.h b/linux-core/drmP.h
index 13f97eee..5827efba 100644
--- a/linux-core/drmP.h
+++ b/linux-core/drmP.h
@@ -1083,6 +1083,7 @@ static inline int drm_mtrr_del(int handle, unsigned long offset,
 }
 
 #define drm_core_has_MTRR(dev) (0)
+#define DRM_MTRR_WC		0
 #endif