diff --git a/mkfs.bcachefs b/mkfs.bcachefs
index a0541d52..b3631bad 100755
--- a/mkfs.bcachefs
+++ b/mkfs.bcachefs
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/sh
 
-SDIR="$(dirname "$(readlink -f "$0")")"
-exec "$SDIR/bcachefs" format "$@"
+SDIR="$(readlink -f "$0")"
+exec "${SDIR%/*}/bcachefs" format "$@"