diff --git a/roles/borg_client/templates/backup-mysql.sh.j2 b/roles/borg_client/templates/backup-mysql.sh.j2
index 9f17b7f8b891911b2f6aa8d7f5cb63da4fd9e83f..9aee38dc718614c5bdcf52c745c0509f80cec2b2 100644
--- a/roles/borg_client/templates/backup-mysql.sh.j2
+++ b/roles/borg_client/templates/backup-mysql.sh.j2
@@ -4,5 +4,5 @@ mysql_opts="--defaults-file={{mysql_backup_defaults}}"
 backupdir="{{mysql_backup_dir}}"
 
 [[ ! -d "$backupdir" ]] && mkdir -p "$backupdir"
-rm -rf "$backupdir"/*
+rm -rf "${backupdir:?}"/*
 mariabackup $mysql_opts --backup --target-dir="$backupdir"