diff --git a/src/frontends/qt4/QDocument.cpp b/src/frontends/qt4/QDocument.cpp
index 04dc9f0c5f..0cf28596ea 100644
--- a/src/frontends/qt4/QDocument.cpp
+++ b/src/frontends/qt4/QDocument.cpp
@@ -42,6 +42,7 @@
 #include "support/lstrings.h"
 
 #include <QCloseEvent>
+#include <QScrollBar>
 #include <QTextCursor>
 
 #include <map>