diff --git a/src/corelib/kernel/qvariant.cpp b/src/corelib/kernel/qvariant.cpp
index 894ebcbb80..0afeaa02d6 100644
--- a/src/corelib/kernel/qvariant.cpp
+++ b/src/corelib/kernel/qvariant.cpp
@@ -73,6 +73,7 @@ QT_BEGIN_NAMESPACE
 #  define FLT_DIG 6
 #endif
 
+namespace {
 template<typename T>
 struct TypeDefiniton {
     static const bool IsAvailable = true;
@@ -99,6 +100,7 @@ struct CoreTypesFilter {
         static const bool IsAccepted = QTypeModuleInfo<T>::IsCore && TypeDefiniton<T>::IsAvailable;
     };
 };
+} // namspace
 
 static void construct(QVariant::Private *x, const void *copy)
 {
diff --git a/src/gui/kernel/qguivariant.cpp b/src/gui/kernel/qguivariant.cpp
index 78d431f9bd..f0baf7064c 100644
--- a/src/gui/kernel/qguivariant.cpp
+++ b/src/gui/kernel/qguivariant.cpp
@@ -98,6 +98,7 @@ Q_GUI_EXPORT const QVariant::Handler *qt_widgets_variant_handler = 0;
 
 Q_CORE_EXPORT const QVariant::Handler *qcoreVariantHandler();
 
+namespace {
 template<typename T>
 struct TypeDefiniton {
     static const bool IsAvailable = true;
@@ -141,6 +142,7 @@ struct CoreAndGuiTypesFilter {
         static const bool IsAccepted = (QTypeModuleInfo<T>::IsCore || QTypeModuleInfo<T>::IsGui) && TypeDefiniton<T>::IsAvailable;
     };
 };
+} // namespace
 
 static void construct(QVariant::Private *x, const void *copy)
 {