diff --git a/tests/image_test.c b/tests/image_test.c
index e15049a..5cf3d54 100644
--- a/tests/image_test.c
+++ b/tests/image_test.c
@@ -7,7 +7,7 @@
 #define STB_DEFINE
 #include "stb.h"
 
-//#define PNGSUITE_PRIMARY
+#define PNGSUITE_PRIMARY
 
 #if 0
 void test_ycbcr(void)