diff --git a/docker-compose.yml b/docker-compose.yml
index c512cbf..7225605 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -107,8 +107,8 @@ services:
     image: minio/minio:latest
     container_name: "cvfs-minio"
     environment:
-      - MINIO_ROOT_USER: ${MINIO_ROOT_USER:-minioadmin}
-      - MINIO_ROOT_PASSWORD: ${MINIO_ROOT_PASSWORD:-minioadmin}
+      - MINIO_ROOT_USER=${MINIO_ROOT_USER:-minioadmin}
+      - MINIO_ROOT_PASSWORD=${MINIO_ROOT_PASSWORD:-minioadmin}
     volumes:
       - minio_data:/data
     command: server /data --console-address ":9001"