diff --git a/codecov/__init__.py b/codecov/__init__.py
index 82e12136..1ec0261c 100644
--- a/codecov/__init__.py
+++ b/codecov/__init__.py
@@ -405,7 +405,7 @@ def main(*argv, **kwargs):
         # --------
         # AppVeyor
         # --------
-        elif os.getenv('CI') == "True" and os.getenv('APPVEYOR') == 'True':
+        elif os.getenv('CI', 'false').lower() == 'true' and os.getenv('APPVEYOR', 'false').lower() == 'true':
             # http://www.appveyor.com/docs/environment-variables
             query.update(dict(branch=os.getenv('APPVEYOR_REPO_BRANCH'),
                               service="appveyor",