diff --git a/programs/explorer/explorer.c b/programs/explorer/explorer.c
index a4f93bca544..4f82dedfc47 100644
--- a/programs/explorer/explorer.c
+++ b/programs/explorer/explorer.c
@@ -21,7 +21,6 @@
  */
 
 #define COBJMACROS
-#define NONAMELESSUNION
 
 #include "wine/unicode.h"
 #include "wine/debug.h"