diff --git a/packages/next/src/build/utils.ts b/packages/next/src/build/utils.ts
index a91de4fbead04..6a75bf97c5906 100644
--- a/packages/next/src/build/utils.ts
+++ b/packages/next/src/build/utils.ts
@@ -1935,7 +1935,15 @@ const server = http.createServer(async (req, res) => {
 })
 const currentPort = parseInt(process.env.PORT, 10) || 3000
 const hostname = process.env.HOSTNAME || 'localhost'
+const keepAliveTimeout = parseInt(process.env.KEEP_ALIVE_TIMEOUT, 10);
 
+if (
+  !Number.isNaN(keepAliveTimeout) &&
+    Number.isFinite(keepAliveTimeout) &&
+    keepAliveTimeout >= 0
+) {
+  server.keepAliveTimeout = keepAliveTimeout
+}
 server.listen(currentPort, (err) => {
   if (err) {
     console.error("Failed to start server", err)