diff --git a/packages/next/server/config.ts b/packages/next/server/config.ts
index 400324e11c60951..892607bca179d79 100644
--- a/packages/next/server/config.ts
+++ b/packages/next/server/config.ts
@@ -57,17 +57,15 @@ const experimentalWarning = execOnce(
   }
 )
 
-export function setHttpClientAndAgentOptions(config: NextConfig) {
+export function setHttpClientAndAgentOptions(config: {
+  httpAgentOptions?: NextConfig['httpAgentOptions']
+  experimental?: {
+    enableUndici?: boolean
+  }
+}) {
   if (isAboveNodejs16) {
-    if (
-      config.experimental?.enableUndici &&
-      !config.experimental?.appDir &&
-      isAboveNodejs18
-    ) {
-      Log.warn(
-        `\`enableUndici\` option is unnecessary in Node.js v${NODE_18_VERSION} or greater.`
-      )
-    } else {
+    // Node.js 18 has undici built-in.
+    if (config.experimental?.enableUndici && !isAboveNodejs18) {
       // When appDir is enabled undici is the default because of Response.clone() issues in node-fetch
       ;(global as any).__NEXT_USE_UNDICI = config.experimental?.enableUndici
     }