diff --git a/ext/node/polyfills/http.ts b/ext/node/polyfills/http.ts
index 67981e8de4..ceaf7aeb89 100644
--- a/ext/node/polyfills/http.ts
+++ b/ext/node/polyfills/http.ts
@@ -1820,6 +1820,8 @@ export function get(...args: any[]) {
   return req;
 }
 
+export const maxHeaderSize = 16_384;
+
 export {
   Agent,
   ClientRequest,
@@ -1848,4 +1850,5 @@ export default {
   get,
   validateHeaderName,
   validateHeaderValue,
+  maxHeaderSize,
 };
diff --git a/tests/unit_node/http_test.ts b/tests/unit_node/http_test.ts
index 6672b97474..c298f2abb2 100644
--- a/tests/unit_node/http_test.ts
+++ b/tests/unit_node/http_test.ts
@@ -998,3 +998,7 @@ Deno.test("[node/http] ServerResponse getHeaders", () => {
   assertEquals(res.getHeaderNames(), ["bar", "foo"]);
   assertEquals(res.getHeaders(), { "bar": "baz", "foo": "bar" });
 });
+
+Deno.test("[node/http] maxHeaderSize is defined", () => {
+  assertEquals(http.maxHeaderSize, 16_384);
+});