diff --git a/src/libs/qmljsdebugclient/qpacketprotocol_p.h b/src/libs/qmljsdebugclient/qpacketprotocol_p.h
index 5b1803ad6bd..c6a5826a25d 100644
--- a/src/libs/qmljsdebugclient/qpacketprotocol_p.h
+++ b/src/libs/qmljsdebugclient/qpacketprotocol_p.h
@@ -47,8 +47,10 @@
 
 QT_BEGIN_HEADER
 
+QT_BEGIN_NAMESPACE
 class QIODevice;
 class QBuffer;
+QT_END_NAMESPACE
 
 namespace QmlJsDebugClient {