diff --git a/tox.ini b/tox.ini
index c5743f0..e26b368 100644
--- a/tox.ini
+++ b/tox.ini
@@ -12,7 +12,8 @@ setenv = VIRTUAL_ENV={envdir}
          LC_ALL=C
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
-commands = python setup.py testr --testr-args='{posargs}'
+commands = /bin/rm -f .testrepository/times.dbm
+           python setup.py testr --testr-args='{posargs}'
 distribute = false
 
 [testenv:pep8]