diff --git a/arch-config/scripts/pieces/thunderbird-backup.sh b/arch-config/scripts/pieces/thunderbird-backup.sh
index 44eb6d73..34465803 100755
--- a/arch-config/scripts/pieces/thunderbird-backup.sh
+++ b/arch-config/scripts/pieces/thunderbird-backup.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/usr/bin/env sh
 set -euo pipefail
 
 # prompt for password
diff --git a/arch-config/scripts/pieces/thunderbird-restore.sh b/arch-config/scripts/pieces/thunderbird-restore.sh
index 03306980..e22eb40c 100755
--- a/arch-config/scripts/pieces/thunderbird-restore.sh
+++ b/arch-config/scripts/pieces/thunderbird-restore.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/usr/bin/env sh
 set -euo pipefail
 
 # prompt for password