diff --git a/tests/conform/test-utils.c b/tests/conform/test-utils.c
index b765b4697..87c043755 100644
--- a/tests/conform/test-utils.c
+++ b/tests/conform/test-utils.c
@@ -3,8 +3,8 @@
 
 #include "test-utils.h"
 
-#define FB_WIDTH 640
-#define FB_HEIGHT 480
+#define FB_WIDTH 512
+#define FB_HEIGHT 512
 
 void
 test_utils_init (TestUtilsGTestFixture *fixture,