diff --git a/lib/web/fetch/index.js b/lib/web/fetch/index.js
index 85d4c2e9fed..b4f6b5f22f2 100644
--- a/lib/web/fetch/index.js
+++ b/lib/web/fetch/index.js
@@ -705,7 +705,7 @@ async function mainFetch (fetchParams, recursive) {
       response.type === 'opaque' &&
       internalResponse.status === 206 &&
       internalResponse.rangeRequested &&
-      !request.headers.contains('range', true)
+      !request.headersList.contains('range', true)
     ) {
       response = internalResponse = makeNetworkError()
     }