diff --git a/src/corelib/kernel/qmetaobject.cpp b/src/corelib/kernel/qmetaobject.cpp
index 19c437a4ec..f2aafba008 100644
--- a/src/corelib/kernel/qmetaobject.cpp
+++ b/src/corelib/kernel/qmetaobject.cpp
@@ -3160,19 +3160,20 @@ bool QMetaProperty::isAlias() const
     return (data.flags() & Alias);
 }
 
+#if QT_DEPRECATED_SINCE(6, 4)
 /*!
     \internal
+    Historically:
     Executes metacall with QMetaObject::RegisterPropertyMetaType flag.
     Returns id of registered type or QMetaType::UnknownType if a type
     could not be registered for any reason.
+    Obsolete since Qt 6
 */
 int QMetaProperty::registerPropertyType() const
 {
-    int registerResult = -1;
-    void *argv[] = { &registerResult };
-    mobj->static_metacall(QMetaObject::RegisterPropertyMetaType, data.index(mobj), argv);
-    return registerResult == -1 ? QMetaType::UnknownType : registerResult;
+    return typeId();
 }
+#endif
 
 QMetaProperty::QMetaProperty(const QMetaObject *mobj, int index)
     : mobj(mobj),
diff --git a/src/corelib/kernel/qmetaobject.h b/src/corelib/kernel/qmetaobject.h
index 6fe259868f..228968d37d 100644
--- a/src/corelib/kernel/qmetaobject.h
+++ b/src/corelib/kernel/qmetaobject.h
@@ -332,7 +332,10 @@ public:
     inline const QMetaObject *enclosingMetaObject() const { return mobj; }
 
 private:
+#if QT_DEPRECATED_SINCE(6, 4)
+    QT_DEPRECATED_VERSION_X_6_4("obsolete, simply returns typeId()")
     int registerPropertyType() const;
+#endif
 
     struct Data {
         enum { Size = 5 };
diff --git a/src/tools/moc/generator.cpp b/src/tools/moc/generator.cpp
index 3e838818f9..3f97544cf2 100644
--- a/src/tools/moc/generator.cpp
+++ b/src/tools/moc/generator.cpp
@@ -1040,6 +1040,7 @@ void Generator::generateMetacall()
 }
 
 
+// ### Qt 7 (6.x?): remove
 QMultiMap<QByteArray, int> Generator::automaticPropertyMetaTypesHelper()
 {
     QMultiMap<QByteArray, int> automaticPropertyMetaTypes;