diff --git a/tox.ini b/tox.ini
index bec51c0..94d4f8e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -12,7 +12,8 @@ setenv =
    VIRTUAL_ENV={envdir}
    OS_TEST_PATH=./watcherclient/tests/unit
 deps = -r{toxinidir}/test-requirements.txt
-commands = python setup.py testr --slowest --testr-args='{posargs}'
+commands = rm -f .testrepository/times.dbm
+           python setup.py testr --slowest --testr-args='{posargs}'
 
 [testenv:pep8]
 commands = flake8