diff --git a/benchmarks/websocket-benchmark.mjs b/benchmarks/websocket-benchmark.mjs
index e9af6646697..a16233c8e76 100644
--- a/benchmarks/websocket-benchmark.mjs
+++ b/benchmarks/websocket-benchmark.mjs
@@ -79,11 +79,11 @@ experiments['undici'] = {
 if (typeof WebSocketStream === 'function') {
   experiments['undici - stream'] = {
     fn: (ws, binary) => {
-      const { readable, writable } = ws
       /** @type {ReadableStreamDefaultReader<string | Uint8Array>} */
-      const reader = readable.getReader()
+      const reader = ws.reader
       /** @type {WritableStreamDefaultWriter<string | BufferSource>} */
-      const writer = writable.getWriter()
+      const writer = ws.writer
+
       return async (ev) => {
         ev.start()
         await writer.write(binary)
@@ -95,7 +95,11 @@ if (typeof WebSocketStream === 'function') {
     connect: async (url) => {
       const ws = new WebSocketStream(url)
 
-      return await ws.opened
+      const { readable, writable } = await ws.opened
+      const reader = readable.getReader()
+      const writer = writable.getWriter()
+
+      return { reader, writer, close: () => ws.close() }
     },
 
     binaries
@@ -158,12 +162,16 @@ async function init () {
 
     const ws = await connect('ws://localhost:5001')
 
+    const needShowBytes = binaries.length !== 2 || typeof binaries[0] === typeof binaries[1]
     for (let i = 0; i < binaries.length; ++i) {
       const binary = binaries[i]
       const bytes = Buffer.byteLength(binary)
 
       const binaryType = typeof binary === 'string' ? 'string' : 'binary'
-      const roundName = `${name} [${Math.floor(bytes / (1024))}Kib (${binaryType})]`
+      const roundName = needShowBytes
+        ? `${name} [${Math.floor(bytes / 1024)}Kib (${binaryType})]`
+        : `${name} [${binaryType}]`
+
       round[roundName] = fn(ws, binary)
       experimentsInfo[roundName] = { bytes, binaryType }
     }