diff --git a/rtgui/editwindow.cc b/rtgui/editwindow.cc
index 6287407e0..23bdb4dc0 100644
--- a/rtgui/editwindow.cc
+++ b/rtgui/editwindow.cc
@@ -19,7 +19,7 @@
 #include <options.h>
 #include <preferences.h>
 #include <cursormanager.h>
-#include <gtk\gtkwidget.h>
+#include <gtk/gtkwidget.h>
 
 static EditWindow* editWnd = NULL;