diff -r 3b1d2cc6603e -r efcb47c64a72 src/model.cpp
--- a/src/model.cpp	Thu Feb 09 21:04:33 2017 +0200
+++ b/src/model.cpp	Thu Feb 09 22:46:37 2017 +0200
@@ -19,6 +19,8 @@
 #include "model.h"
 #include "ldObject.h"
 #include "documentmanager.h"
+#include "linetypes/empty.h"
+#include "linetypes/comment.h"
 
 Model::Model(DocumentManager* manager) :
     QObject {manager},