diff --git a/tests/integration/test_config.py b/tests/integration/test_config.py
index 11f1bed..bb7cca4 100644
--- a/tests/integration/test_config.py
+++ b/tests/integration/test_config.py
@@ -6,7 +6,7 @@ import vcr
 def test_set_serializer_default_config(tmpdir):
     my_vcr = vcr.VCR(serializer='json')
 
-    with my_vcr.use_cassette(str(tmpdir.join('test.json'))) as cass:
+    with my_vcr.use_cassette(str(tmpdir.join('test.json'))):
         assert my_vcr.serializer == 'json'
         urllib2.urlopen('http://httpbin.org/get')