diff --git a/tests/conftest.py b/tests/conftest.py
index f6a1a3becaa797f9709e1b34fb1e0cbe0ae8a8ef..ca2db17715f0cec2fcf9bdf3a4cf8e31ae3feed7 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -5,10 +5,11 @@ import pytest
 from . import testutil
 
 @pytest.fixture(scope='session', autouse=True)
-def clean_environment():
+def clean_environment(tmpdir_factory):
     os.environ.pop('RTAUTH', None)
     os.environ.pop('RTPASSWD', None)
     os.environ.pop('RTSERVER', None)
     os.environ.pop('RTUSER', None)
     os.environ['CONSERVANCY_REPOSITORY'] = str(testutil.test_path('repository'))
     os.environ['HOME'] = str(testutil.test_path('userconfig'))
+    os.environ['XDG_CACHE_DIR'] = str(tmpdir_factory.mktemp('.cache'))