diff --git a/src/plugins/debugger/qml/qmlengine.h b/src/plugins/debugger/qml/qmlengine.h
index 4616573e548..00768ae689f 100644
--- a/src/plugins/debugger/qml/qmlengine.h
+++ b/src/plugins/debugger/qml/qmlengine.h
@@ -39,7 +39,9 @@
 
 #include <QtNetwork/QAbstractSocket>
 
+QT_BEGIN_NAMESPACE
 class QTextDocument;
+QT_END_NAMESPACE
 
 namespace Core {
 class IEditor;