diff --git a/tox.ini b/tox.ini
index a57a6263..59274405 100644
--- a/tox.ini
+++ b/tox.ini
@@ -13,7 +13,9 @@ setenv =
    LANGUAGE=en_US
    LC_ALL=en_US.utf-8
 deps = -r{toxinidir}/test-requirements.txt
-commands = python setup.py test --slowest --testr-args='{posargs}'
+commands =
+  rm -f .testrepository/times.dbm
+  python setup.py test --slowest --testr-args='{posargs}'
 
 [testenv:fullstack]
 basepython = python2.7