1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/handlers/register.py b/synapse/handlers/register.py
index 83f4daaa8c..8e601b052b 100644
--- a/synapse/handlers/register.py
+++ b/synapse/handlers/register.py
@@ -54,7 +54,7 @@ class RegistrationHandler(BaseHandler):
                 400,
                 "User ID must only contain characters which do not"
                 " require URL encoding.",
-                Codes.INVALID_USER_NAME
+                Codes.INVALID_USERNAME
             )
 
         user = UserID(localpart, self.hs.hostname)