diff --git a/dlls/d2d1/tests/d2d1.c b/dlls/d2d1/tests/d2d1.c
index cd58d642ce1..3e2eda8a4a4 100644
--- a/dlls/d2d1/tests/d2d1.c
+++ b/dlls/d2d1/tests/d2d1.c
@@ -9690,7 +9690,7 @@ static void test_effect(BOOL d3d11)
     ID2D1Bitmap *bitmap;
     ID2D1Effect *effect;
     D2D1_SIZE_U size;
-    BYTE buffer[64];
+    BYTE buffer[256];
     BOOL cached;
     CLSID clsid;
     HRESULT hr;