diff --git a/src/resolver.ts b/src/resolver.ts
index d6db1f6..d6e9084 100644
--- a/src/resolver.ts
+++ b/src/resolver.ts
@@ -140,7 +140,7 @@ export const resolver = (wretcher: Wretcher) => {
          * Warning: Still experimental on browsers and node.js
          */
         perfs: cb => {
-            fetchRequest.then(res => perfs.observe(res.url, cb))
+            fetchRequest.then(res => perfs.observe(res.url, cb)).catch(() => {/* swallow */ })
             return responseChain
         },
         /**
diff --git a/test/mock.js b/test/mock.js
index 78e09ba..3fde59e 100644
--- a/test/mock.js
+++ b/test/mock.js
@@ -1,7 +1,7 @@
 const fs = require("fs")
 const path = require("path")
 const restify = require("restify")
-const corsMiddleware = require("restify-cors-middleware")
+const corsMiddleware = require("restify-cors-middleware2")
 
 const cors = corsMiddleware({
     origins: ["*"],