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-rw-r--r--synapse/federation/federation_server.py6
1 files changed, 3 insertions, 3 deletions
diff --git a/synapse/federation/federation_server.py b/synapse/federation/federation_server.py
index 83f11d6b88..d8c0b86f23 100644
--- a/synapse/federation/federation_server.py
+++ b/synapse/federation/federation_server.py
@@ -34,7 +34,7 @@ from twisted.internet import defer
 from twisted.internet.abstract import isIPAddress
 from twisted.python import failure
 
-from synapse.api.constants import EduTypes, EventTypes, Membership
+from synapse.api.constants import EduTypes, EventContentFields, EventTypes, Membership
 from synapse.api.errors import (
     AuthError,
     Codes,
@@ -765,11 +765,11 @@ class FederationServer(FederationBase):
         if (
             room_version.msc3083_join_rules
             and event.membership == Membership.JOIN
-            and "join_authorised_via_users_server" in event.content
+            and EventContentFields.AUTHORISING_USER in event.content
         ):
             # We can only authorise our own users.
             authorising_server = get_domain_from_id(
-                event.content["join_authorised_via_users_server"]
+                event.content[EventContentFields.AUTHORISING_USER]
             )
             if authorising_server != self.server_name:
                 raise SynapseError(