diff --git a/tox.ini b/tox.ini
index cc80a7b84..29f5fc120 100644
--- a/tox.ini
+++ b/tox.ini
@@ -132,6 +132,7 @@ description = Generates sample configuration file for monasca-api
 commands = oslo-config-generator --config-file=config-generator/api-config.conf
 
 [testenv:genpolicy]
+basepython = python3
 description = Generates sample policy.json file for monasca-api
 commands = oslopolicy-sample-generator --config-file=config-generator/policy.conf