diff --git a/synapse/http/federation/matrix_federation_agent.py b/synapse/http/federation/matrix_federation_agent.py
index 7c5df38f5f..b4cbe97b41 100644
--- a/synapse/http/federation/matrix_federation_agent.py
+++ b/synapse/http/federation/matrix_federation_agent.py
@@ -79,11 +79,10 @@ class MatrixFederationAgent(object):
 
     def __init__(
         self, reactor, tls_client_options_factory,
-        config, _well_known_tls_policy=None,
+        _well_known_tls_policy=None,
         _srv_resolver=None,
         _well_known_cache=well_known_cache,
     ):
-        self.config = config
         self._reactor = reactor
         self._clock = Clock(reactor)
 
@@ -150,7 +149,7 @@ class MatrixFederationAgent(object):
             tls_options = None
         else:
             tls_options = self._tls_client_options_factory.get_options(
-                res.tls_server_name.decode("ascii"), self.config,
+                res.tls_server_name.decode("ascii"),
             )
 
         # make sure that the Host header is set correctly
diff --git a/tests/http/federation/test_matrix_federation_agent.py b/tests/http/federation/test_matrix_federation_agent.py
index a942410492..0e732580cc 100644
--- a/tests/http/federation/test_matrix_federation_agent.py
+++ b/tests/http/federation/test_matrix_federation_agent.py
@@ -59,7 +59,6 @@ class MatrixFederationAgentTests(TestCase):
         self.agent = MatrixFederationAgent(
             reactor=self.reactor,
             tls_client_options_factory=ClientTLSOptionsFactory(config),
-            config=config,
             _well_known_tls_policy=TrustingTLSPolicyForHTTPS(),
             _srv_resolver=self.mock_resolver,
             _well_known_cache=self.well_known_cache,