diff --git a/federation/eventauth/eventauth.go b/federation/eventauth/eventauth.go
index bd102213..32b4424b 100644
--- a/federation/eventauth/eventauth.go
+++ b/federation/eventauth/eventauth.go
@@ -310,7 +310,7 @@ func authorizeMember(roomVersion id.RoomVersion, evt, createEvt *pdu.PDU, authEv
 		// 5.1. If there is no state_key property, or no membership property in content, reject.
 		return ErrMemberNotState
 	}
-	authorizedVia := id.UserID(gjson.GetBytes(evt.Content, "authorized_via_users_server").Str)
+	authorizedVia := id.UserID(gjson.GetBytes(evt.Content, "authorised_via_users_server").Str)
 	if authorizedVia != "" {
 		homeserver := authorizedVia.Homeserver()
 		err := evt.VerifySignature(roomVersion, homeserver, getKey)
diff --git a/federation/pdu/auth.go b/federation/pdu/auth.go
index 1f98de06..16706fe5 100644
--- a/federation/pdu/auth.go
+++ b/federation/pdu/auth.go
@@ -61,7 +61,7 @@ func (pdu *PDU) AuthEventSelection(roomVersion id.RoomVersion) (keys AuthEventSe
 			}
 		}
 		if membership == event.MembershipJoin && roomVersion.RestrictedJoins() {
-			authorizedVia := gjson.GetBytes(pdu.Content, "authorized_via_users_server").Str
+			authorizedVia := gjson.GetBytes(pdu.Content, "authorised_via_users_server").Str
 			if authorizedVia != "" {
 				keys.Add(event.StateMember.Type, authorizedVia)
 			}