diff --git a/src/Gui/ActiveObjectList.h b/src/Gui/ActiveObjectList.h
index b7d021a8e2..636d271411 100644
--- a/src/Gui/ActiveObjectList.h
+++ b/src/Gui/ActiveObjectList.h
@@ -28,6 +28,7 @@
 
 #include <map>
 #include <Gui/TreeItemMode.h>
+#include <FCGlobal.h>
 
 
 namespace App {