diff --git a/tox.ini b/tox.ini
index 57a5777b0..3e71ea8bc 100644
--- a/tox.ini
+++ b/tox.ini
@@ -13,7 +13,8 @@ deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 whitelist_externals = bash
                       rm
-commands = ostestr '{posargs}'
+commands =
+  {toxinidir}/tools/ostestr_compat_shim.sh {posargs}
 passenv = http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY
 
 [testenv:pep8]