diff --git a/synapse/mautrix-signal/registration.yaml b/synapse/mautrix-signal/registration.yaml
index 8fea0a8..55a6d6e 100755
--- a/synapse/mautrix-signal/registration.yaml
+++ b/synapse/mautrix-signal/registration.yaml
@@ -1,5 +1,5 @@
 id: signal
-url: http://localhost:29328
+url: http://mautrix-signal:29328
 as_token: yKXM0W3OxQ9L39KPYOVGxP06xQYV6Mncsg88lVcvEVFedSoRdvDUfofDmcnrX4ez
 hs_token: hEAE8FEJty6LY66P68IyF49MEz2osrUx1srMKJj036vhY4ZIUe0zd4uV8tBGtT3s
 sender_localpart: HN1FK2qPokfzRpdUKSthoZolf24w0NWG