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-rw-r--r--synapse/rest/client/v2_alpha/register.py3
1 files changed, 1 insertions, 2 deletions
diff --git a/synapse/rest/client/v2_alpha/register.py b/synapse/rest/client/v2_alpha/register.py
index 8da73a8615..e8d34b06b0 100644
--- a/synapse/rest/client/v2_alpha/register.py
+++ b/synapse/rest/client/v2_alpha/register.py
@@ -132,8 +132,7 @@ class RegisterRestServlet(RestServlet):
             # Set the desired user according to the AS API (which uses the
             # 'user' key not 'username'). Since this is a new addition, we'll
             # fallback to 'username' if they gave one.
-            if isinstance(body.get("user"), basestring):
-                desired_username = body["user"]
+            desired_username = body.get("user", desired_username)
 
             if isinstance(desired_username, basestring):
                 result = yield self._do_appservice_registration(