diff --git a/gtk2_ardour/window_manager.h b/gtk2_ardour/window_manager.h
index f3775320e9..d6385389cf 100644
--- a/gtk2_ardour/window_manager.h
+++ b/gtk2_ardour/window_manager.h
@@ -24,12 +24,14 @@
 #include <string>
 #include <map>
 
-#include <glibmm/refptr.h>
 #include <sigc++/trackable.h>
 
+#include "gtkmm2ext/actions.h"
 #include "gtkmm2ext/bindings.h"
 #include "gtkmm2ext/window_proxy.h"
 
+#include <glibmm/refptr.h>
+
 #include "ardour/session_handle.h"
 
 class XMLNode;