diff --git a/lib/mock/snapshot-recorder.js b/lib/mock/snapshot-recorder.js
index 298fcac1d66..8e8a00b2068 100644
--- a/lib/mock/snapshot-recorder.js
+++ b/lib/mock/snapshot-recorder.js
@@ -394,7 +394,7 @@ class SnapshotRecorder {
       snapshot
     }))
 
-    await writeFile(resolvedPath, JSON.stringify(data, null, 2), 'utf8', { flush: true })
+    await writeFile(resolvedPath, JSON.stringify(data, null, 2), { flush: true })
   }
 
   /**