diff --git a/src/common/QskRgbValue.h b/src/common/QskRgbValue.h
index 07b62e11..ecfcc87f 100644
--- a/src/common/QskRgbValue.h
+++ b/src/common/QskRgbValue.h
@@ -361,7 +361,7 @@ namespace QskRgb
                 return qRgba( r, g, b, a );
             }
 
-#define QSK_CHECK_CONSTEXPR_LITERAL
+#define QSK_CHECK_CONSTEXPR_LITERAL 1
 #ifdef QSK_CHECK_CONSTEXPR_LITERAL
             static_assert( "#123456"_rgba == 0xFF123456, "not constexpr" );
             static_assert( "#123456"_argb == 0xFF123456, "not constexpr" );