diff --git a/tests.sh b/tests.sh
index 9bfc56b..f1c3364 100755
--- a/tests.sh
+++ b/tests.sh
@@ -1,6 +1,6 @@
-#!/bin/bash -xe
+#!/bin/sh -xe
 
 pip install -e .
 pytest -vvv -s --cache-clear
-find . -name __pycache__ -type d | xargs rm -rf
+find . -name __pycache__ -type d -exec rm -rf {} +
 rm -rf .pytest_cache/ .mypy_cache/ rgain.egg-info/