diff --git a/drivers/gpu/drm/nouveau/nv50_vram.c b/drivers/gpu/drm/nouveau/nv50_vram.c
index 47489ed..58e98ad 100644
--- a/drivers/gpu/drm/nouveau/nv50_vram.c
+++ b/drivers/gpu/drm/nouveau/nv50_vram.c
@@ -42,7 +42,7 @@
 {
 	int type = (tile_flags & NOUVEAU_GEM_TILE_LAYOUT_MASK) >> 8;
 
-	if (likely(type < sizeof(types) && types[type]))
+	if (likely(type < ARRAY_SIZE(types) && types[type]))
 		return true;
 	return false;
 }