diff --git a/qinling/api/controllers/v1/resources.py b/qinling/api/controllers/v1/resources.py
index 3c41a1bd..1e5be6a2 100644
--- a/qinling/api/controllers/v1/resources.py
+++ b/qinling/api/controllers/v1/resources.py
@@ -353,7 +353,7 @@ class ScaleInfo(Resource):
 class Webhook(Resource):
     id = types.uuid
     function_id = types.uuid
-    function_version = wsme.wsattr(int, default=0)
+    function_version = wsme.wsattr(int)
     description = wtypes.text
     project_id = wsme.wsattr(wtypes.text, readonly=True)
     created_at = wsme.wsattr(wtypes.text, readonly=True)
diff --git a/qinling/tests/unit/api/controllers/v1/test_webhook.py b/qinling/tests/unit/api/controllers/v1/test_webhook.py
index f39b48e7..60d0f603 100644
--- a/qinling/tests/unit/api/controllers/v1/test_webhook.py
+++ b/qinling/tests/unit/api/controllers/v1/test_webhook.py
@@ -93,3 +93,18 @@ class TestWebhookController(base.APITest):
 
         self.assertEqual(200, resp.status_int)
         self.assertEqual(1, resp.json.get("function_version"))
+
+    def test_put_without_version(self):
+        db_api.increase_function_version(self.func_id, 0)
+        webhook = self.create_webhook(self.func_id, function_version=1)
+
+        self.assertEqual(1, webhook.function_version)
+
+        resp = self.app.put_json(
+            '/v1/webhooks/%s' % webhook.id,
+            {'description': 'updated description'}
+        )
+
+        self.assertEqual(200, resp.status_int)
+        self.assertEqual(1, resp.json.get("function_version"))
+        self.assertEqual('updated description', resp.json.get("description"))