diff --git a/docker-compose.yml b/docker-compose.yml
index d48cede0..8110efd8 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1825,7 +1825,7 @@ services:
           host: invidious-db
           port: 5432
         check_tables: true
-        signature_server: invidious-sig-helper:12999
+        signature_server: 'invidious-sig-helper:12999'
         visitor_data: ${INVID_VISITOR_DATA}
         po_token: ${INVID_PO_TOKEN}
         # external_port: