diff --git a/src/controllers/PermissionController.ts b/src/controllers/PermissionController.ts
index 6be00fd..208fe6f 100644
--- a/src/controllers/PermissionController.ts
+++ b/src/controllers/PermissionController.ts
@@ -96,7 +96,7 @@ export class PermissionController {
             return new ResponsePermission(existingPermission);
         }
 
-        await this.permissionRepository.update(oldPermission, await permission.toPermission());
+        await this.permissionRepository.save(await permission.updatePermission(oldPermission));
 
         return new ResponsePermission(await this.permissionRepository.findOne({ id: permission.id }, { relations: ['principal'] }));
     }
diff --git a/src/models/actions/UpdatePermission.ts b/src/models/actions/UpdatePermission.ts
index 26c2a83..dec0ad8 100644
--- a/src/models/actions/UpdatePermission.ts
+++ b/src/models/actions/UpdatePermission.ts
@@ -37,14 +37,12 @@ export class UpdatePermission {
     /**
      * Converts a Permission object based on this.
      */
-    public async toPermission(): Promise<Permission> {
-        let newPermission: Permission = new Permission();
+    public async updatePermission(permission: Permission): Promise<Permission> {
+        permission.principal = await this.getPrincipal();
+        permission.target = this.target;
+        permission.action = this.action;
 
-        newPermission.principal = await this.getPrincipal();
-        newPermission.target = this.target;
-        newPermission.action = this.action;
-
-        return newPermission;
+        return permission;
     }
 
     /**