diff --git a/src/corelib/kernel/qcoreapplication.cpp b/src/corelib/kernel/qcoreapplication.cpp
index 3ae4e523c8..71ff47eab8 100644
--- a/src/corelib/kernel/qcoreapplication.cpp
+++ b/src/corelib/kernel/qcoreapplication.cpp
@@ -54,6 +54,7 @@
 #include <qfile.h>
 #include <qfileinfo.h>
 #include <qhash.h>
+#include <qmutex.h>
 #include <private/qprocess_p.h>
 #include <qstandardpaths.h>
 #include <qtextcodec.h>