diff --git a/tools/bootconfig/scripts/ftrace.sh b/tools/bootconfig/scripts/ftrace.sh
index 186eed923041..cc5250c64699 100644
--- a/tools/bootconfig/scripts/ftrace.sh
+++ b/tools/bootconfig/scripts/ftrace.sh
@@ -1,3 +1,4 @@
+#!/bin/sh
 # SPDX-License-Identifier: GPL-2.0-only
 
 clear_trace() { # reset trace output