diff --git a/tox.ini b/tox.ini
index dbec4f1..338f43e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -13,7 +13,10 @@ setenv =
    PYTHONWARNINGS=default::DeprecationWarning
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
-commands = python setup.py test --slowest --testr-args='{posargs}'
+whitelist_externals = rm
+commands =
+  rm -f .testrepository/times.dbm
+  python setup.py test --slowest --testr-args='{posargs}'
 
 [testenv:pep8]
 commands = flake8