diff --git a/git_review/tests/__init__.py b/git_review/tests/__init__.py
index b945170..dfb71fe 100644
--- a/git_review/tests/__init__.py
+++ b/git_review/tests/__init__.py
@@ -167,7 +167,7 @@ class BaseGitReviewTestCase(testtools.TestCase, GerritHelpers):
                              '--name', 'test/test_project')
 
         # ensure user proxy conf doesn't interfere with tests
-        os.environ['NO_PROXY'] = '*'
+        os.environ['no_proxy'] = os.environ['NO_PROXY'] = '*'
 
         # prepare repository for the testing
         self._run_git('clone', self.project_uri)