diff --git a/src/corelib/kernel/qpermissions.h b/src/corelib/kernel/qpermissions.h
index dee606674f1..9573e377e5f 100644
--- a/src/corelib/kernel/qpermissions.h
+++ b/src/corelib/kernel/qpermissions.h
@@ -36,9 +36,6 @@ class QPermission
     template <typename T, typename Enable = void>
     static constexpr inline bool is_permission_v = false;
 
-    template <typename T>
-    static constexpr inline bool is_permission_v<T, typename T::QtPermissionHelper> = true;
-
     template <typename T>
     using if_permission = std::enable_if_t<is_permission_v<T>, bool>;
 public:
@@ -72,6 +69,9 @@ private:
     friend class QCoreApplication;
 };
 
+template <typename T>
+constexpr bool QPermission::is_permission_v<T, typename T::QtPermissionHelper> = true;
+
 #define QT_PERMISSION(ClassName) \
     using QtPermissionHelper = void; \
     friend class QPermission; \