diff --git a/.changes/fs-write-uint8array-arraybuffer.md b/.changes/fs-write-uint8array-arraybuffer.md
new file mode 100644
index 0000000000..37b53d913e
--- /dev/null
+++ b/.changes/fs-write-uint8array-arraybuffer.md
@@ -0,0 +1,6 @@
+---
+fs: patch
+fs-js: patch
+---
+
+`readFile` now returns a more specific type `Promise<Uint8Array<ArrayBuffer>>` instead of the default `Promise<Uint8Array<ArrayBufferLike>`
diff --git a/plugins/fs/guest-js/index.ts b/plugins/fs/guest-js/index.ts
index d4858b0e85..572cc1e85b 100644
--- a/plugins/fs/guest-js/index.ts
+++ b/plugins/fs/guest-js/index.ts
@@ -739,7 +739,7 @@ interface ReadFileOptions {
 async function readFile(
   path: string | URL,
   options?: ReadFileOptions
-): Promise<Uint8Array> {
+): Promise<Uint8Array<ArrayBuffer>> {
   if (path instanceof URL && path.protocol !== 'file:') {
     throw new TypeError('Must be a file URL.')
   }