diff --git a/lib/fetch/index.js b/lib/fetch/index.js
index dfc7b824082..90479764eae 100644
--- a/lib/fetch/index.js
+++ b/lib/fetch/index.js
@@ -792,7 +792,7 @@ async function schemeFetch (fetchParams) {
       return makeNetworkError('invalid path called')
     }
     case 'blob:': {
-      resolveObjectURL ??= require('buffer').resolveObjectURL
+      resolveObjectURL = resolveObjectURL || require('buffer').resolveObjectURL
 
       // 1. Run these steps, but abort when the ongoing fetch is terminated:
       //    1. Let blob be request’s current URL’s blob URL entry’s object.