diff --git a/src/frontends/qt4/GuiRef.cpp b/src/frontends/qt4/GuiRef.cpp
index 5cf12053b3..373cc19e48 100644
--- a/src/frontends/qt4/GuiRef.cpp
+++ b/src/frontends/qt4/GuiRef.cpp
@@ -32,6 +32,7 @@
 #include <QPushButton>
 #include <QToolTip>
 #include <QCloseEvent>
+#include <QtGui>
 
 using namespace std;
 using namespace lyx::support;