diff --git a/playbooks/roles/borg-backup-server/files/verify-borg-backups.sh b/playbooks/roles/borg-backup-server/files/verify-borg-backups.sh
index 88061e3b2f..7ee1614bd1 100644
--- a/playbooks/roles/borg-backup-server/files/verify-borg-backups.sh
+++ b/playbooks/roles/borg-backup-server/files/verify-borg-backups.sh
@@ -1,5 +1,9 @@
 #!/bin/bash
 
+# When under cron, SHELL can bin /bin/sh which the "sudo -s" below
+# obeys.  Let's just use bash.
+export SHELL=/bin/bash
+
 pushd /opt/backups
 
 for u in borg-*; do