diff --git a/mattermost/docker-compose.yml b/mattermost/docker-compose.yml
index 4735ee4..9491696 100644
--- a/mattermost/docker-compose.yml
+++ b/mattermost/docker-compose.yml
@@ -28,9 +28,9 @@ services:
   postgres-server:
     image: ${PG_IMAGE}
     environment:
-      - POSTGRES_DB="${MM_POSTGRES_DB}"
-      - POSTGRES_USER="${MM_POSTGRES_USER}"
-      - POSTGRES_PASSWORD="${MM_POSTGRES_PASSWORD}"
+      - POSTGRES_DB=${MM_POSTGRES_DB}
+      - POSTGRES_USER=${MM_POSTGRES_USER}
+      - POSTGRES_PASSWORD=${MM_POSTGRES_PASSWORD}
     volumes:
       - ${MM_VOLUME}/db:/var/lib/postgresql/data
     restart: always
\ No newline at end of file