diff --git a/tox.ini b/tox.ini
index ccbf8c7..a582d07 100644
--- a/tox.ini
+++ b/tox.ini
@@ -9,7 +9,8 @@ install_command = pip install -U {opts} {packages}
 setenv =
    VIRTUAL_ENV={envdir}
 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:pep8]
 commands = flake8