diff --git a/src/corelib/tools/qcontainerfwd.h b/src/corelib/tools/qcontainerfwd.h
index 4aec3574ffa..069be4ef101 100644
--- a/src/corelib/tools/qcontainerfwd.h
+++ b/src/corelib/tools/qcontainerfwd.h
@@ -61,6 +61,10 @@ template <class T> class QStack;
 template<class T, qsizetype Prealloc = 256> class QVarLengthArray;
 template <class T> class QList;
 template<typename T> using QVector = QList<T>;
+class QStringList;
+using QByteArrayList = QList<QByteArray>;
+class QMetaType;
+class QVariant;
 
 QT_END_NAMESPACE
 
diff --git a/src/tools/qdbusxml2cpp/qdbusxml2cpp.cpp b/src/tools/qdbusxml2cpp/qdbusxml2cpp.cpp
index 48a0d91adbd..96928f4da37 100644
--- a/src/tools/qdbusxml2cpp/qdbusxml2cpp.cpp
+++ b/src/tools/qdbusxml2cpp/qdbusxml2cpp.cpp
@@ -71,13 +71,7 @@ static const char includeList[] =
     "#include <QtCore/QVariant>\n";
 
 static const char forwardDeclarations[] =
-    "QT_BEGIN_NAMESPACE\n"
-    "#include <QtCore/qcontainerfwd.h>\n"
-    "class QByteArray;\n"
-    "class QString;\n"
-    "class QStringList;\n"
-    "class QVariant;\n"
-    "QT_END_NAMESPACE\n";
+    "#include <QtCore/qcontainerfwd.h>\n";
 
 static QDBusIntrospection::Interfaces readInput()
 {