diff --git a/src/corelib/kernel/qmetatype.cpp b/src/corelib/kernel/qmetatype.cpp
index 8d15b4a2aa..6d17ceb2b8 100644
--- a/src/corelib/kernel/qmetatype.cpp
+++ b/src/corelib/kernel/qmetatype.cpp
@@ -852,11 +852,29 @@ static const struct { const char * typeName; int typeNameLength; int type; } typ
     {nullptr, 0, QMetaType::UnknownType}
 };
 
+static const struct : QMetaTypeModuleHelper
+{
+    QtPrivate::QMetaTypeInterface *interfaceForType(int type) const override {
+        switch (type) {
+            QT_FOR_EACH_STATIC_PRIMITIVE_TYPE(QT_METATYPE_CONVERT_ID_TO_TYPE)
+            QT_FOR_EACH_STATIC_PRIMITIVE_POINTER(QT_METATYPE_CONVERT_ID_TO_TYPE)
+            QT_FOR_EACH_STATIC_CORE_CLASS(QT_METATYPE_CONVERT_ID_TO_TYPE)
+            QT_FOR_EACH_STATIC_CORE_POINTER(QT_METATYPE_CONVERT_ID_TO_TYPE)
+            QT_FOR_EACH_STATIC_CORE_TEMPLATE(QT_METATYPE_CONVERT_ID_TO_TYPE)
+        default:
+            return nullptr;
+        }
+    }
+} metatypeHelper;
+
+static const QMetaTypeModuleHelper *qMetaTypeCoreHelper = &metatypeHelper;
 Q_CORE_EXPORT const QMetaTypeModuleHelper *qMetaTypeGuiHelper = nullptr;
 Q_CORE_EXPORT const QMetaTypeModuleHelper *qMetaTypeWidgetsHelper = nullptr;
 
 static const QMetaTypeModuleHelper *qModuleHelperForType(int type)
 {
+    if (type <= QMetaType::LastCoreType)
+        return qMetaTypeCoreHelper;
     if (type >= QMetaType::FirstGuiType && type <= QMetaType::LastGuiType)
         return qMetaTypeGuiHelper;
     else if (type >= QMetaType::FirstWidgetsType && type <= QMetaType::LastWidgetsType)
@@ -1589,24 +1607,19 @@ const QMetaObject *QMetaType::metaObjectForType(int type)
 
 static QtPrivate::QMetaTypeInterface *interfaceForType(int typeId)
 {
+    QtPrivate::QMetaTypeInterface *iface = nullptr;
     if (typeId >= QMetaType::User) {
         if (auto reg = customTypeRegistry())
-            return reg->getCustomType(typeId);
+            iface = reg->getCustomType(typeId);
+    } else {
+        if (auto moduleHelper = qModuleHelperForType(typeId))
+            iface = moduleHelper->interfaceForType(typeId);
     }
-    if (auto moduleHelper = qModuleHelperForType(typeId))
-        return moduleHelper->interfaceForType(typeId);
 
-    switch (typeId) {
-        QT_FOR_EACH_STATIC_PRIMITIVE_TYPE(QT_METATYPE_CONVERT_ID_TO_TYPE)
-        QT_FOR_EACH_STATIC_PRIMITIVE_POINTER(QT_METATYPE_CONVERT_ID_TO_TYPE)
-        QT_FOR_EACH_STATIC_CORE_CLASS(QT_METATYPE_CONVERT_ID_TO_TYPE)
-        QT_FOR_EACH_STATIC_CORE_POINTER(QT_METATYPE_CONVERT_ID_TO_TYPE)
-        QT_FOR_EACH_STATIC_CORE_TEMPLATE(QT_METATYPE_CONVERT_ID_TO_TYPE)
-    default:
-        if (typeId != QMetaType::UnknownType)
-            qWarning("Trying to construct an instance of an invalid type, type id: %i", typeId);
-        return nullptr;
-    }
+    if (!iface && typeId != QMetaType::UnknownType)
+        qWarning("Trying to construct an instance of an invalid type, type id: %i", typeId);
+
+    return iface;
 }
 
 /*!
diff --git a/src/corelib/kernel/qmetatype_p.h b/src/corelib/kernel/qmetatype_p.h
index 9e391e6476..bda4301afd 100644
--- a/src/corelib/kernel/qmetatype_p.h
+++ b/src/corelib/kernel/qmetatype_p.h
@@ -155,6 +155,10 @@ public:
     virtual bool convert(const void *, int, void *, int) const { return false; }
 };
 
+extern Q_CORE_EXPORT const QMetaTypeModuleHelper *qMetaTypeGuiHelper;
+extern Q_CORE_EXPORT const QMetaTypeModuleHelper *qMetaTypeWidgetsHelper;
+
+
 namespace QtMetaTypePrivate {
 template<typename T>
 struct TypeDefinition {
diff --git a/src/gui/kernel/qguivariant.cpp b/src/gui/kernel/qguivariant.cpp
index ae6def7176..ebb180dc8e 100644
--- a/src/gui/kernel/qguivariant.cpp
+++ b/src/gui/kernel/qguivariant.cpp
@@ -178,8 +178,6 @@ static const struct : QMetaTypeModuleHelper
 
 } // namespace used to hide QVariant handler
 
-extern Q_CORE_EXPORT const QMetaTypeModuleHelper *qMetaTypeGuiHelper;
-
 void qRegisterGuiVariant()
 {
     qMetaTypeGuiHelper = &qVariantGuiHelper;
diff --git a/src/widgets/kernel/qwidgetsvariant.cpp b/src/widgets/kernel/qwidgetsvariant.cpp
index 935a53935f..b98a83887f 100644
--- a/src/widgets/kernel/qwidgetsvariant.cpp
+++ b/src/widgets/kernel/qwidgetsvariant.cpp
@@ -64,11 +64,8 @@ static const struct : QMetaTypeModuleHelper
 
 }  // namespace
 
-extern Q_CORE_EXPORT const QMetaTypeModuleHelper *qMetaTypeWidgetsHelper;
-
 void qRegisterWidgetsVariant()
 {
-    qRegisterMetaType<QWidget*>();
     qMetaTypeWidgetsHelper = &qVariantWidgetsHelper;
 }
 Q_CONSTRUCTOR_FUNCTION(qRegisterWidgetsVariant)