diff --git a/src/corelib/kernel/qvariant.cpp b/src/corelib/kernel/qvariant.cpp
index 7310fd9be2..3eba3685d0 100644
--- a/src/corelib/kernel/qvariant.cpp
+++ b/src/corelib/kernel/qvariant.cpp
@@ -298,6 +298,12 @@ static QVariant::Private clonePrivate(const QVariant::Private &other)
 
 } // anonymous used to hide QVariant handlers
 
+inline QVariant::Private::Private(const QtPrivate::QMetaTypeInterface *iface) noexcept
+    : is_shared(false), is_null(false), packedType(quintptr(iface) >> 2)
+{
+    Q_ASSERT((quintptr(iface) & 0x3) == 0);
+}
+
 template <typename T> inline
 QVariant::Private::Private(std::piecewise_construct_t, const T &t)
     : is_shared(!CanUseInternalSpace<T>), is_null(std::is_same_v<T, std::nullptr_t>)
@@ -826,7 +832,7 @@ QVariant::QVariant(const QVariant &p)
 
     \sa QVariant::fromValue(), QMetaType::Type
 */
-QVariant::QVariant(QMetaType type, const void *copy) : d(type)
+QVariant::QVariant(QMetaType type, const void *copy) : d(type.iface())
 {
     if (isValidMetaTypeForVariant(type.iface(), copy))
         customConstruct(type.iface(), &d, copy);
@@ -978,7 +984,7 @@ void QVariant::detach()
         return;
 
     Q_ASSERT(isValidMetaTypeForVariant(d.typeInterface(), constData()));
-    Private dd(d.type());
+    Private dd(d.typeInterface());
     customConstruct(d.typeInterface(), &dd, constData());
     if (!d.data.shared->ref.deref())
         customClear(&d);
diff --git a/src/corelib/kernel/qvariant.h b/src/corelib/kernel/qvariant.h
index aca2db2cbe..75da91b9e5 100644
--- a/src/corelib/kernel/qvariant.h
+++ b/src/corelib/kernel/qvariant.h
@@ -446,14 +446,8 @@ public:
         quintptr packedType : sizeof(QMetaType) * 8 - 2;
 
         constexpr Private() noexcept : is_shared(false), is_null(true), packedType(0) {}
+        explicit Private(const QtPrivate::QMetaTypeInterface *iface) noexcept;
         template <typename T> explicit Private(std::piecewise_construct_t, const T &t);
-        explicit Private(QMetaType type) noexcept : is_shared(false), is_null(false)
-        {
-            quintptr mt = quintptr(type.d_ptr);
-            Q_ASSERT((mt & 0x3) == 0);
-            packedType = mt >> 2;
-        }
-        explicit Private(int type) noexcept : Private(QMetaType(type)) {}
 
         const void *storage() const
         { return is_shared ? data.shared->data() : &data.data; }