diff --git a/letsencrypt/client/auth_handler.py b/letsencrypt/client/auth_handler.py
index 41c7a9f68..05f3722cf 100644
--- a/letsencrypt/client/auth_handler.py
+++ b/letsencrypt/client/auth_handler.py
@@ -203,9 +203,8 @@ class AuthHandler(object):  # pylint: disable=too-many-instance-attributes
 
     def _path_satisfied(self, dom):
         """Returns whether a path has been completely satisfied."""
-        return all(
-            self.responses[dom][i] is not None and
-            self.responses[dom][i] is not False for i in self.paths[dom])
+        # Make sure that there are no 'None' or 'False' entries along path.
+        return all(self.responses[dom][i] for i in self.paths[dom])
 
     def _get_chall_pref(self, domain):
         """Return list of challenge preferences.