diff --git a/src/plugins/coreplugin/editormanager/editormanager_p.h b/src/plugins/coreplugin/editormanager/editormanager_p.h
index 2a88a5daaaa..b9e021bcb8c 100644
--- a/src/plugins/coreplugin/editormanager/editormanager_p.h
+++ b/src/plugins/coreplugin/editormanager/editormanager_p.h
@@ -37,6 +37,7 @@
 #include <QList>
 #include <QObject>
 #include <QPointer>
+#include <QSet>
 #include <QString>
 #include <QVariant>