diff --git a/bin/get_eigen.sh b/bin/get_eigen.sh
index bcd8bb3f1..c05162ce5 100755
--- a/bin/get_eigen.sh
+++ b/bin/get_eigen.sh
@@ -1,3 +1,4 @@
+#! /bin/bash -e
 # SPDX-License-Identifier: EPL-2.0 OR GPL-2.0-or-later
 # SPDX-FileCopyrightText: Bradley M. Bell <bradbell@seanet.com>
 # SPDX-FileContributor: 2003-24 Bradley M. Bell