diff --git a/src/network/access/qnetworkaccessmanager.cpp b/src/network/access/qnetworkaccessmanager.cpp
index bb90e893059..df75b859710 100644
--- a/src/network/access/qnetworkaccessmanager.cpp
+++ b/src/network/access/qnetworkaccessmanager.cpp
@@ -95,6 +95,8 @@
 
 #include "qnetconmonitor_p.h"
 
+#include <mutex>
+
 QT_BEGIN_NAMESPACE
 
 Q_GLOBAL_STATIC(QNetworkAccessFileBackendFactory, fileBackend)