diff --git a/apps/opencs/view/world/creator.hpp b/apps/opencs/view/world/creator.hpp
index b2d80cf2f9..b763481991 100644
--- a/apps/opencs/view/world/creator.hpp
+++ b/apps/opencs/view/world/creator.hpp
@@ -5,6 +5,8 @@
 
 #include <QWidget>
 
+#include "../../model/doc/document.hpp"
+
 #include "../../model/world/scope.hpp"
 #include "../../model/world/universalid.hpp"