diff --git a/tests/common.py b/tests/common.py
index 0cc88fe0..e4c58dcc 100644
--- a/tests/common.py
+++ b/tests/common.py
@@ -220,6 +220,7 @@ class OscTestCase(unittest.TestCase):
             shutil.rmtree(self.tmpdir)
         except:
             pass
+        os.environ.pop("OSC_CONFIG", "")
         self.assertTrue(len(EXPECTED_REQUESTS) == 0)
 
     def _get_fixtures_dir(self):