diff --git a/synapse/crypto/keyclient.py b/synapse/crypto/keyclient.py
index 4fca215c97..1d85990369 100644
--- a/synapse/crypto/keyclient.py
+++ b/synapse/crypto/keyclient.py
@@ -135,5 +135,5 @@ class SynapseKeyClientFactory(Factory):
     def protocol(self):
         protocol = SynapseKeyClientProtocol()
         protocol.path = self.path
-        protocol.path = self.host
+        protocol.host = self.host
         return protocol