diff --git a/src/Model/Table/OrgGroupsTable.php b/src/Model/Table/OrgGroupsTable.php
index aa4662a..13ee4c5 100644
--- a/src/Model/Table/OrgGroupsTable.php
+++ b/src/Model/Table/OrgGroupsTable.php
@@ -35,7 +35,7 @@ class OrgGroupsTable extends AppTable
         return $validator;
     }
     
-    public function checkIfGroupAdmin(int $groupId, mixed $user): bool
+    public function checkIfGroupAdmin(int $groupId, User $user): bool
     {
         $orgGroup = $this->get($groupId, ['contain' => 'Users']);
         if (empty($orgGroup)) {