diff --git a/synapse/mautrix-telegram/config.yaml b/synapse/mautrix-telegram/config.yaml
index 8d9a2fe..c1f68de 100644
--- a/synapse/mautrix-telegram/config.yaml
+++ b/synapse/mautrix-telegram/config.yaml
@@ -26,7 +26,7 @@ homeserver:
 # Changing these values requires regeneration of the registration.
 appservice:
     # The address that the homeserver can use to connect to this appservice.
-    address: http://localhost:29317
+    address: http://mautrix-telegram:29317
     # When using https:// the TLS certificate and key files for the address.
     tls_cert: false
     tls_key: false