diff --git a/drivers/gpu/drm/nouveau/nv50_vram.c b/drivers/gpu/drm/nouveau/nv50_vram.c
index 47489ed0a5a8245a1dbc70af590d52eaaa165195..58e98ad36347b7b5b82c81f23d2636da8227b9ad 100644
--- a/drivers/gpu/drm/nouveau/nv50_vram.c
+++ b/drivers/gpu/drm/nouveau/nv50_vram.c
@@ -42,7 +42,7 @@ nv50_vram_flags_valid(struct drm_device *dev, u32 tile_flags)
 {
 	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;
 }