diff --git a/puppet/zulip/files/postgresql/env-wal-g b/puppet/zulip/files/postgresql/env-wal-g
index 3ceee2ce11..7667c8d6dc 100755
--- a/puppet/zulip/files/postgresql/env-wal-g
+++ b/puppet/zulip/files/postgresql/env-wal-g
@@ -21,5 +21,5 @@ if ! s3_backups_bucket=$(crudini --get "$ZULIP_SECRETS_CONF" secrets s3_backups_
     echo "Could not determine which s3 bucket to use:" "$s3_backups_bucket"
     exit 1
 fi
-export WALE_S3_PREFIX="s3://$s3_backups_bucket"
+export WALG_S3_PREFIX="s3://$s3_backups_bucket"
 exec /usr/local/bin/wal-g "$@"