diff --git a/.changeset/popular-candles-watch.md b/.changeset/popular-candles-watch.md
new file mode 100644
index 000000000..c392d5e47
--- /dev/null
+++ b/.changeset/popular-candles-watch.md
@@ -0,0 +1,5 @@
+---
+"@opennextjs/aws": patch
+---
+
+fix(middleware): copy wasm files for the external middleware
diff --git a/packages/open-next/src/build/createMiddleware.ts b/packages/open-next/src/build/createMiddleware.ts
index 38e81fc58..19fc80500 100644
--- a/packages/open-next/src/build/createMiddleware.ts
+++ b/packages/open-next/src/build/createMiddleware.ts
@@ -7,7 +7,10 @@ import {
 } from "config/util.js";
 import logger from "../logger.js";
 import type { MiddlewareInfo } from "../types/next-types.js";
-import { buildEdgeBundle } from "./edge/createEdgeBundle.js";
+import {
+  buildEdgeBundle,
+  copyMiddlewareResources,
+} from "./edge/createEdgeBundle.js";
 import * as buildHelper from "./helper.js";
 import { installDependencies } from "./installDeps.js";
 import {
@@ -53,6 +56,8 @@ export async function createMiddleware(
 
   if (config.middleware?.external) {
     const outputPath = path.join(outputDir, "middleware");
+    copyMiddlewareResources(options, edgeMiddlewareInfo, outputPath);
+
     fs.mkdirSync(outputPath, { recursive: true });
 
     // Copy open-next.config.mjs