diff --git a/expat/test-driver-wrapper.sh b/expat/test-driver-wrapper.sh
index 30b34d54..36a18526 100755
--- a/expat/test-driver-wrapper.sh
+++ b/expat/test-driver-wrapper.sh
@@ -1,4 +1,4 @@
-#! /bin/bash
+#! /usr/bin/env bash
 #                          __  __            _
 #                       ___\ \/ /_ __   __ _| |_
 #                      / _ \\  /| '_ \ / _` | __|