diff --git a/src/websockets/qwebsocketprotocol.cpp b/src/websockets/qwebsocketprotocol.cpp
index df87a93..9556d18 100644
--- a/src/websockets/qwebsocketprotocol.cpp
+++ b/src/websockets/qwebsocketprotocol.cpp
@@ -38,6 +38,7 @@
 ****************************************************************************/
 
 #include "qwebsocketprotocol_p.h"
+#include <limits>
 #include <QtCore/QString>
 #include <QtCore/QSet>
 #include <QtCore/QtEndian>