diff --git a/synapse/third_party_rules/access_rules.py b/synapse/third_party_rules/access_rules.py
index 521b0347a..e3f97bdf3 100644
--- a/synapse/third_party_rules/access_rules.py
+++ b/synapse/third_party_rules/access_rules.py
@@ -454,11 +454,8 @@ class RoomAccessRules(object):
              invite (EventBase): The m.room.member event with "invite" membership.
              threepid_invite_token (str): The state key from the 3PID invite.
         """
-        if "third_party_signed" in invite.content:
-            token = invite.content.get("third_party_signed", {}).get("token", "")
-        else:
-            token = invite.content.get(
-                "third_party_invite", {},
-            ).get("signed", {}).get("token", "")
+        token = invite.content.get(
+            "third_party_invite", {},
+        ).get("signed", {}).get("token", "")
 
         return token == threepid_invite_token