diff --git a/lib/client.js b/lib/client.js
index 91979ec..4a92be0 100644
--- a/lib/client.js
+++ b/lib/client.js
@@ -340,7 +340,7 @@ class HttpTransportClient {
 }
 
 function isCriticalError(err) {
-  if (err && err.statusCode < 500) {
+  if (err && (err.statusCode < 500 || err.isBrokenCircuitError)) {
     return false;
   }
   return true;