diff --git a/services/traefik/docker-compose.yml b/services/traefik/docker-compose.yml
index 2e5bd64..abe226e 100644
--- a/services/traefik/docker-compose.yml
+++ b/services/traefik/docker-compose.yml
@@ -11,7 +11,7 @@ services:
       - /var/run/docker.sock:/var/run/docker.sock
       - ./traefik.toml:/traefik.toml
       - ./traefik_dynamic.toml:/traefik_dynamic.toml
-      - {CONFIG_ROOT}/acme.json:/acme.json
+      - ${CONFIG_ROOT}/acme.json:/acme.json
 
 networks:
   default: