diff --git a/src/main.py b/src/main.py
index d94ebde..eff6ba8 100644
--- a/src/main.py
+++ b/src/main.py
@@ -77,7 +77,8 @@ async def test_data(api_key: str, request: Request, size: str) -> StreamingRespo
 
         return StreamingResponse(
             status_code=status.HTTP_200_OK,
-            content=generate_data(size, BUFFER_SIZE)
+            content=generate_data(size, BUFFER_SIZE),
+            headers={'Content-Type': 'application/octet-stream'}
         )
 
     except MinSizePerRequestError: