diff --git a/src/corelib/kernel/qsharedmemory_p.h b/src/corelib/kernel/qsharedmemory_p.h
index 51f729cf23..95fe0d1083 100644
--- a/src/corelib/kernel/qsharedmemory_p.h
+++ b/src/corelib/kernel/qsharedmemory_p.h
@@ -53,6 +53,8 @@
 
 #include "qsharedmemory.h"
 
+#include <QtCore/qstring.h>
+
 #ifdef QT_NO_SHAREDMEMORY
 # ifndef QT_NO_SYSTEMSEMAPHORE
 namespace QSharedMemoryPrivate