diff --git a/src/utils/body.ts b/src/utils/body.ts
index 8c96fe5d..ef4f6f77 100644
--- a/src/utils/body.ts
+++ b/src/utils/body.ts
@@ -30,8 +30,12 @@ export function readRawBody<E extends Encoding = "utf8">(
     (event.node.req as any)[RawBodySymbol] ||
     (event.node.req as any).body; /* unjs/unenv #8 */
   if (_rawBody) {
-    const promise = Promise.resolve(_rawBody);
-    return encoding ? promise.then((buff) => buff.toString(encoding)) : promise;
+    const promise = Promise.resolve(
+      Buffer.isBuffer(_rawBody) ? _rawBody : Buffer.from(_rawBody)
+    );
+    return encoding
+      ? promise.then((buff) => buff.toString(encoding))
+      : (promise as Promise<any>);
   }
 
   if (!Number.parseInt(event.node.req.headers["content-length"] || "")) {
diff --git a/test/body.test.ts b/test/body.test.ts
index 2a674ff0..53069d97 100644
--- a/test/body.test.ts
+++ b/test/body.test.ts
@@ -174,7 +174,7 @@ describe("", () => {
       expect(result.text).toBe("200");
     });
 
-    it("handle raw body with buffer type (unenv)", async () => {
+    it("handle readBody with buffer type (unenv)", async () => {
       app.use(
         "/",
         eventHandler(async (event) => {
@@ -194,6 +194,23 @@ describe("", () => {
       expect(result.text).toBe("200");
     });
 
+    it("handle readRawBody with array buffer type (unenv)", async () => {
+      app.use(
+        "/",
+        eventHandler(async (event) => {
+          // Emulate unenv
+          // @ts-ignore
+          event.node.req.body = new Uint8Array([1, 2, 3]);
+          const body = await readRawBody(event, false);
+          expect(body).toBeInstanceOf(Buffer);
+          expect(body).toMatchObject(Buffer.from([1, 2, 3]));
+          return "200";
+        })
+      );
+      const result = await request.post("/api/test").send();
+      expect(result.text).toBe("200");
+    });
+
     it("parses multipart form data", async () => {
       app.use(
         "/",