diff --git a/test/run_tests b/test/run_tests
index 5f9ea2c14c089a7be8e553956483e3fbefc0f8c2..033916ea8cd49b39ca4849468924b628e19c8af4 100755
--- a/test/run_tests
+++ b/test/run_tests
@@ -1,11 +1,11 @@
-#! /bin/bash
+#! /bin/sh
 DIR=$(dirname $0)/..
 if python --version 2>&1 | grep -q '^Python 2'; then
     PYTHON=python
 else
     PYTHON=python2
 fi
-if [ "$*" == "" ]
+if [ ! -n "$*" ]
 then
 PYTHONPATH=$DIR exec $PYTHON ${DIR}/scapy/tools/UTscapy.py -t regression.uts -f html -l -o /tmp/scapy_regression_test_$(date +%Y%m%d-%H%M%S).html
 else