diff --git a/.env.sample b/.env.sample
index 94376785c132f931b2915c90828b159911eeee41..d97f7391e535332849abc3dfd3b763976edc5143 100644
--- a/.env.sample
+++ b/.env.sample
@@ -2,7 +2,7 @@
 # docker-compose.yml : base, required
 # dev.yml to expose port 80 to $PORT
 # traefik.yml to access your pico from traefik
-DOCKER_FILE=docker-compose.yml:dev.yml
+COMPOSE_FILE=docker-compose.yml:dev.yml
 PORT=8084
 NAME=monsite
 # Your fully qualified domain name