diff --git a/dlls/kernel/resource.c b/dlls/kernel/resource.c
index 8be32ca65d1..942b9b05b32 100644
--- a/dlls/kernel/resource.c
+++ b/dlls/kernel/resource.c
@@ -22,6 +22,8 @@
 #include "config.h"
 #include "wine/port.h"
 
+#define NONAMELESSUNION
+#define NONAMELESSSTRUCT
 #include "windef.h"
 #include "winternl.h"
 #include "winbase.h"