diff --git a/contrib/endpoints/src/api_manager/quota_control.cc b/contrib/endpoints/src/api_manager/quota_control.cc
index 29fdb3fae1e..8a5b65322d6 100644
--- a/contrib/endpoints/src/api_manager/quota_control.cc
+++ b/contrib/endpoints/src/api_manager/quota_control.cc
@@ -46,7 +46,10 @@ void QuotaControl(std::shared_ptr<context::RequestContext> context,
         TRACE(trace_span) << "Quota service control request returned with "
                           << "status " << status.ToString();
 
-        continuation(status);
+        // quota control is using "failed open" policy. If the server is not
+        // available, allow the request to go.
+        continuation((status.code() == Code::UNAVAILABLE) ? utils::Status::OK
+                                                          : status);
       });
 }