diff --git a/tests/trajectory-planner/circular-arcs/test-simple.sh b/tests/trajectory-planner/circular-arcs/test-simple.sh
index 50fbb695f9e..7c77d63bc78 100755
--- a/tests/trajectory-planner/circular-arcs/test-simple.sh
+++ b/tests/trajectory-planner/circular-arcs/test-simple.sh
@@ -1,3 +1,7 @@
+#!/bin/bash
+
+set -e
+
 cp position.blank position.txt
 mv constraints.log constraints_old.log
 linuxcnc circular_arcs.ini > test.log