diff --git a/letsencrypt/plugins/standalone.py b/letsencrypt/plugins/standalone.py
index 3cd8cd95f..1bca3c036 100644
--- a/letsencrypt/plugins/standalone.py
+++ b/letsencrypt/plugins/standalone.py
@@ -197,7 +197,8 @@ class Authenticator(common.Plugin):
 
     def get_chall_pref(self, domain):
         # pylint: disable=unused-argument,missing-docstring
-        return SUPPORTED_CHALLENGES
+        return [chall for chall in SUPPORTED_CHALLENGES
+                if chall in self.supported_challenges]
 
     def perform(self, achalls):  # pylint: disable=missing-docstring
         if any(util.already_listening(port) for port in self._necessary_ports):