diff --git a/browser.js b/browser.js
index 22ed05a7a..91a1bb1e6 100644
--- a/browser.js
+++ b/browser.js
@@ -10,6 +10,7 @@ var stdSerializers = {
   mapHttpResponse: mock,
   wrapRequestSerializer: passthrough,
   wrapResponseSerializer: passthrough,
+  wrapErrorSerializer: passthrough,
   req: mock,
   res: mock,
   err: asErrValue