diff --git a/Installation.md b/Installation.md
index 9d691a1..b886943 100644
--- a/Installation.md
+++ b/Installation.md
@@ -228,7 +228,7 @@ services:
           memory: 512M
     environment:
       POSTGRES_DB: ${DB_DATABASE:-clrghouz}
-      POSTGRES_USER: ${DB_USERNAME-clrghouz}
+      POSTGRES_USER: ${DB_USERNAME:-clrghouz}
       POSTGRES_PASSWORD: ${DB_PASSWORD}
     #labels:
     #  cron.container.daily: "root#pg_dumpall -U clrghouz#S3_BUCKET=restic.docker restic -q --no-cache backup --stdin --stdin-filename docker-clrghouz-database"