diff --git a/src/build.ts b/src/build.ts
index 2c1207841d..421808d95c 100644
--- a/src/build.ts
+++ b/src/build.ts
@@ -19,7 +19,12 @@ import {
 } from "mlly";
 import { generateFSTree } from "./utils/tree";
 import { getRollupConfig, RollupConfig } from "./rollup/config";
-import { prettyPath, writeFile, isDirectory } from "./utils";
+import {
+  prettyPath,
+  writeFile,
+  isDirectory,
+  resolvePath as resolveNitroPath,
+} from "./utils";
 import { GLOB_SCAN_PATTERN, scanHandlers } from "./scan";
 import type { Nitro } from "./types";
 import { runtimeDir } from "./dirs";
@@ -102,10 +107,10 @@ export async function writeTypes(nitro: Nitro) {
     if (typeof mw.handler !== "string" || !mw.route) {
       continue;
     }
-    const relativePath = relative(typesDir, mw.handler).replace(
-      /\.[a-z]+$/,
-      ""
-    );
+    const relativePath = relative(
+      typesDir,
+      resolveNitroPath(mw.handler, nitro.options)
+    ).replace(/\.(js|mjs|cjs|ts|mts|cts|tsx|jsx)$/, "");
 
     if (!routeTypes[mw.route]) {
       routeTypes[mw.route] = {};