diff --git a/src/gui_gtk_x11.c b/src/gui_gtk_x11.c
index b76aacd..5e74adc 100644
--- a/src/gui_gtk_x11.c
+++ b/src/gui_gtk_x11.c
@@ -86,7 +86,7 @@
 #  include <gdk/gdkkeysyms.h>
 # endif
 # include <gdk/gdk.h>
-# ifdef WIN3264
+# ifdef MSWIN
 #  include <gdk/gdkwin32.h>
 # else
 #  include <gdk/gdkx.h>