diff --git a/compose.yml b/compose.yml
index 7e8e037..39e8264 100644
--- a/compose.yml
+++ b/compose.yml
@@ -119,7 +119,7 @@ services:
     deploy:
       labels:
           backupbot.backup: "true"
-          backupbot.backup.pre-hook: "mkdir -p /tmp/backup/ && PGPASSWORD=$(cat /run/secrets/db_password) pg_dump -U ${POSTGRES_USER} ${POSTGRES_DB} > /tmp/backup/backup.sql"
+          backupbot.backup.pre-hook: "mkdir -p /tmp/backup/ && PGPASSWORD=$$(cat /run/secrets/db_password) pg_dump -U $${POSTGRES_USER} $${POSTGRES_DB} > /tmp/backup/backup.sql"
           backupbot.backup.post-hook: "rm -rf /tmp/backup"
           backupbot.backup.path: "/tmp/backup/"