diff --git a/.env.sample b/.env.sample
index d777283f3d53ee199cc8f80aebd5e303ef77397b..1fe8f2c962ad278914d465424be0eb94937a1a29 100644
--- a/.env.sample
+++ b/.env.sample
@@ -1,6 +1,6 @@
 COMPOSE_FILE=docker-compose.yml:ports.yml
 HOST=0.0.0.0
-PORT=5000
+FLASK_PORT=5000
 MYSQL_USER=mirador_backend
 MYSQL_PASSWORD=randompassword
 MYSQL_ROOT_PASSWORD=otherrandompassword