diff --git a/sh/tests/joker-num_test.sh b/sh/tests/joker-num_test.sh
index 65490748..7eb09ce0 100755
--- a/sh/tests/joker-num_test.sh
+++ b/sh/tests/joker-num_test.sh
@@ -1,5 +1,6 @@
 #!/usr/bin/env bash
 
+set -euo pipefail
 IFS='
 '
 script_dirS=$(cd -P "$(dirname "$BASH_SOURCE")" &>/dev/null && pwd)