diff --git a/src/resources/beta/messages/batches.ts b/src/resources/beta/messages/batches.ts
index b564cb1c..74f4e53b 100644
--- a/src/resources/beta/messages/batches.ts
+++ b/src/resources/beta/messages/batches.ts
@@ -187,6 +187,7 @@ export class Batches extends APIResource {
         ...options,
         headers: {
           'anthropic-beta': [...(betas ?? []), 'message-batches-2024-09-24'].toString(),
+          Accept: 'application/binary',
           ...options?.headers,
         },
         __binaryResponse: true,
diff --git a/src/resources/messages/batches.ts b/src/resources/messages/batches.ts
index 3d9539cf..a6b328e2 100644
--- a/src/resources/messages/batches.ts
+++ b/src/resources/messages/batches.ts
@@ -92,7 +92,14 @@ export class Batches extends APIResource {
     }
 
     return this._client
-      .get(batch.results_url, { ...options, __binaryResponse: true })
+      .get(batch.results_url, {
+        ...options,
+        headers: {
+          Accept: 'application/binary',
+          ...options?.headers,
+        },
+        __binaryResponse: true,
+      })
       ._thenUnwrap((_, props) => JSONLDecoder.fromResponse(props.response, props.controller));
   }
 }