diff --git a/lib/fetch/response.js b/lib/fetch/response.js
index 7828c2d1b3e..fc6746bfa8d 100644
--- a/lib/fetch/response.js
+++ b/lib/fetch/response.js
@@ -103,7 +103,7 @@ class Response {
 
     // 3. If status is not a redirect status, then throw a RangeError.
     if (!redirectStatus.includes(status)) {
-      throw new RangeError('Invalid status code')
+      throw new RangeError('Invalid status code ' + status)
     }
 
     // 4. Let responseObject be the result of creating a Response object,
@@ -478,7 +478,7 @@ function initializeResponse (response, init, body) {
     if (nullBodyStatus.includes(response.status)) {
       throw webidl.errors.exception({
         header: 'Response constructor',
-        message: 'Invalid response status code.'
+        message: 'Invalid response status code ' + response.status
       })
     }