diff --git a/src/Bican/Roles/Traits/HasRoleAndPermission.php b/src/Bican/Roles/Traits/HasRoleAndPermission.php
index 840cc1c..325a6af 100644
--- a/src/Bican/Roles/Traits/HasRoleAndPermission.php
+++ b/src/Bican/Roles/Traits/HasRoleAndPermission.php
@@ -164,10 +164,10 @@ public function rolePermissions()
             throw new InvalidArgumentException('[roles.models.permission] must be an instance of \Illuminate\Database\Eloquent\Model');
         }
 
-        return $permissionModel::select(['permissions.*', 'permission_role.created_at as pivot_created_at', 'permission_role.updated_at as pivot_updated_at'])
+        return $permissionModel::select(['permissions.id', 'permissions.slug', 'permission_role.created_at as pivot_created_at', 'permission_role.updated_at as pivot_updated_at'])
                 ->join('permission_role', 'permission_role.permission_id', '=', 'permissions.id')->join('roles', 'roles.id', '=', 'permission_role.role_id')
                 ->whereIn('roles.id', $this->getRoles()->lists('id')->toArray()) ->orWhere('roles.level', '<', $this->level())
-                ->groupBy(['permissions.id', 'pivot_created_at', 'pivot_updated_at']);
+                ->groupBy(['permissions.id', 'permissions.slug', 'permission_role.created_at', 'permission_role.updated_at']);
     }
 
     /**