diff --git a/docker-compose.yml b/docker-compose.yml
index d05657f..b2917bc 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -18,7 +18,7 @@ services:
       - --entrypoints.web.http.redirections.entryPoint.scheme=https
       - --entrypoints.web.http.redirections.entrypoint.permanent=true
       - --certificatesresolvers.myresolver.acme.dnschallenge=true
-      - --certificatesresolvers.myresolver.acme.dnschallenge.provider=${DNS_CHALLENGE_PROVIDER}
+      - --certificatesresolvers.myresolver.acme.dnschallenge.provider=${DNS_CHALLENGE_PROVIDER:-cloudflare}
       # Uncomment to test your configuration by using Let's Encrypt staging certificates
      #- --certificatesresolvers.myresolver.acme.caserver=https://acme-staging-v02.api.letsencrypt.org/directory
       - --certificatesresolvers.myresolver.acme.email=${LETS_ENCRYPT_EMAIL}