diff --git a/src/plugins/coreplugin/mainwindow.cpp b/src/plugins/coreplugin/mainwindow.cpp
index fd0d9ff5242..a8e9160de18 100644
--- a/src/plugins/coreplugin/mainwindow.cpp
+++ b/src/plugins/coreplugin/mainwindow.cpp
@@ -109,6 +109,7 @@
 #include <QMessageBox>
 #include <QMenuBar>
 #include <QPushButton>
+#include <QStyleFactory>
 
 /*
 #ifdef Q_OS_UNIX