diff --git a/myems-api/core/contact.py b/myems-api/core/contact.py
index 7166f0c5..3f780b1f 100644
--- a/myems-api/core/contact.py
+++ b/myems-api/core/contact.py
@@ -237,7 +237,7 @@ class ContactItem:
 
         if not id_.isdigit() or int(id_) <= 0:
             raise falcon.HTTPError(falcon.HTTP_400, title='API.BAD_REQUEST',
-                                   description='API.INVALID_')
+                                   description='API.INVALID_CONTACT_ID')
 
         new_values = json.loads(raw_json)