diff --git a/programs/regedit/treeview.c b/programs/regedit/treeview.c
index 97a0bf2de15..0ac52526392 100644
--- a/programs/regedit/treeview.c
+++ b/programs/regedit/treeview.c
@@ -22,7 +22,7 @@
 #define WIN32_LEAN_AND_MEAN     /* Exclude rarely-used stuff from Windows headers */
 
 #define NONAMELESSUNION
-#define NONAMELESSSTRUCT
+
 #include <windows.h>
 #include <commctrl.h>
 #include <stdlib.h>