diff --git a/src/routes.js b/src/routes.js
index 2a46afb..76fdfd6 100644
--- a/src/routes.js
+++ b/src/routes.js
@@ -29,7 +29,7 @@ router.post("/", async (ctx) => {
     return ctx.throw(406, "empty file");
   }
 
-  const buffer = Buffer.from(ctx.request.rawBody, "binary");
+  const buffer = Buffer.from(ctx.request.rawBody);
   const { iv, k, cipherText } = await encrypt(buffer);
   const uuid = addGist(iv, cipherText);