diff --git a/synapse/federation/federation_server.py b/synapse/federation/federation_server.py
index d15c7e1b40..8f6955ac18 100644
--- a/synapse/federation/federation_server.py
+++ b/synapse/federation/federation_server.py
@@ -205,7 +205,7 @@ class FederationServer(FederationBase):
         result = self._state_resp_cache.get((room_id, event_id))
         if not result:
             with (yield self._server_linearizer.queue((origin, room_id))):
-                resp = yield self.response_cache.set(
+                resp = yield self._state_resp_cache.set(
                     (room_id, event_id),
                     self._on_context_state_request_compute(room_id, event_id)
                 )