diff --git a/pip/_vendor/requests/certs.py b/pip/_vendor/requests/certs.py
index f922b99..2c9d347 100644
--- a/pip/_vendor/requests/certs.py
+++ b/pip/_vendor/requests/certs.py
@@ -14,12 +14,13 @@ packaged CA bundle.
 import os.path
 
 try:
+    raise ImportError # force fallback
     from certifi import where
 except ImportError:
     def where():
         """Return the preferred certificate bundle."""
-        # vendored bundle inside Requests
-        return os.path.join(os.path.dirname(__file__), 'cacert.pem')
+        # system CA certs
+        return '/etc/pki/tls/certs/ca-bundle.crt'
 
 if __name__ == '__main__':
     print(where())