diff --git a/dlls/wineqtdecoder/main.c b/dlls/wineqtdecoder/main.c
index 435951ba933..82563989192 100644
--- a/dlls/wineqtdecoder/main.c
+++ b/dlls/wineqtdecoder/main.c
@@ -27,6 +27,7 @@
 #define COBJMACROS
 #define NONAMELESSSTRUCT
 #define NONAMELESSUNION
+#define WINE_NO_NAMELESS_EXTENSION
 
 #include "windef.h"
 #include "winbase.h"