diff --git a/go-server-server/go/default.go b/go-server-server/go/default.go
index 688d773..ccafc72 100644
--- a/go-server-server/go/default.go
+++ b/go-server-server/go/default.go
@@ -1036,7 +1036,7 @@ func ConfigVrouterVrfIdPost(w http.ResponseWriter, r *http.Request) {
     guid := CacheGetVniId(uint32(attr.Vnid))
     if guid != "" {
         WriteRequestErrorWithSubCode(w, http.StatusConflict, RESRC_EXISTS,
-              "Object already exists {\"vni\":\"" + strconv.Itoa(attr.Vnid) + "\", \"vnet_name\":\"" + guid +"\"}", []string{}, "")
+              "Object already exists: {\"vni\":\"" + strconv.Itoa(attr.Vnid) + "\", \"vnet_name\":\"" + guid +"\"}", []string{}, "")
         return
     }
 
diff --git a/test/test_restapi.py b/test/test_restapi.py
index 7f38783..bf26485 100644
--- a/test/test_restapi.py
+++ b/test/test_restapi.py
@@ -182,7 +182,7 @@ def test_post_vrouter_duplicate(self, setup_restapi_client):
             'vnid': 1001
         })
         assert r.status_code == 409
-        assert r.json()['error']['message'] == "Object already exists {\"vni\":\"1001\", \"vnet_name\":\"vnet-guid-1\"}"
+        assert r.json()['error']['message'] == "Object already exists: {\"vni\":\"1001\", \"vnet_name\":\"vnet-guid-1\"}"
 
     def test_post_vrouter_with_advertise_prefix(self, setup_restapi_client):
         _, _, configdb, restapi_client = setup_restapi_client