diff --git a/src/libs/utils/overlaywidget.h b/src/libs/utils/overlaywidget.h
index 354d5354b00..3470166c735 100644
--- a/src/libs/utils/overlaywidget.h
+++ b/src/libs/utils/overlaywidget.h
@@ -29,6 +29,8 @@
 
 #include <QWidget>
 
+#include <functional>
+
 namespace Utils {
 
 class QTCREATOR_UTILS_EXPORT OverlayWidget : public QWidget