diff --git a/aries_cloudagent/resolver/default/legacy_peer.py b/aries_cloudagent/resolver/default/legacy_peer.py
index 52ec422ad8..ef132ac491 100644
--- a/aries_cloudagent/resolver/default/legacy_peer.py
+++ b/aries_cloudagent/resolver/default/legacy_peer.py
@@ -160,7 +160,9 @@ def didcomm_services_recip_keys_are_refs_routing_keys_are_did_key_ref(
                     ]
                 if "routingKeys" in service:
                     service["routingKeys"] = [
-                        cls.did_key_to_did_key_ref(DIDKey.from_public_key_b58(key, ED25519).key_id)
+                        cls.did_key_to_did_key_ref(
+                            DIDKey.from_public_key_b58(key, ED25519).key_id
+                        )
                         if "did:key:" not in key
                         else cls.did_key_to_did_key_ref(key)
                         for key in service["routingKeys"]