diff --git a/docker-compose.yml b/docker-compose.yml
index 5046648bb2..92af1a03a9 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -20,7 +20,7 @@ services:
     security_opt:
       - no-new-privileges:true
     ports:
-      - "${TRAEFIK_HTTP_PORT:-80}:80"
+      - "${TRAEFIK_HTTP_PORT-80}:80"
     volumes:
       - "traefik:/config"
       - "/var/run/docker.sock:/var/run/docker.sock:ro"