diff --git a/src/libs/qmldebug/qmlenginecontrolclient.cpp b/src/libs/qmldebug/qmlenginecontrolclient.cpp
index 82417ef05aa..2bc1d543020 100644
--- a/src/libs/qmldebug/qmlenginecontrolclient.cpp
+++ b/src/libs/qmldebug/qmlenginecontrolclient.cpp
@@ -27,6 +27,8 @@
 #include "qpacketprotocol.h"
 #include "utils/qtcassert.h"
 
+#include <functional>
+
 namespace QmlDebug {
 
 QmlEngineControlClient::QmlEngineControlClient(QmlDebugConnection *client)