diff --git a/cc/private/toolchain/generate_system_module_map.sh b/cc/private/toolchain/generate_system_module_map.sh
index 6bcbd85..b5e4f2c 100755
--- a/cc/private/toolchain/generate_system_module_map.sh
+++ b/cc/private/toolchain/generate_system_module_map.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!@defaultBash@
 # Copyright 2020 The Bazel Authors. All rights reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");