diff --git a/src/plugins/texteditor/textdocument.h b/src/plugins/texteditor/textdocument.h
index 65caa2b2e6f..8ed2ebbfd90 100644
--- a/src/plugins/texteditor/textdocument.h
+++ b/src/plugins/texteditor/textdocument.h
@@ -34,6 +34,8 @@
 #include <QMap>
 #include <QSharedPointer>
 
+#include <functional>
+
 QT_BEGIN_NAMESPACE
 class QAction;
 class QTextCursor;