diff --git a/src/Gui/Selection.h b/src/Gui/Selection.h
index 3e2f9b4f31..e931f5e398 100644
--- a/src/Gui/Selection.h
+++ b/src/Gui/Selection.h
@@ -34,6 +34,8 @@
 #include <App/DocumentObserver.h>
 #include <Base/Observer.h>
 
+#include "SelectionObject.h"
+
 
 namespace App
 {