diff --git a/tox.ini b/tox.ini
index 63749427..5a85ef42 100644
--- a/tox.ini
+++ b/tox.ini
@@ -16,6 +16,8 @@ deps =
     setuptools
 passenv =
     PYTEST_ADDOPTS
+setenv =
+    HOME=/tmp/nonexistent
 commands =
     python -m coverage run -m pytest {posargs}
     python -m coverage html