diff --git a/internal/server/handler.go b/internal/server/handler.go
index f0e0e05bba211a950345a96fe551b2872fb48ae3..ba6bfb662f2f27ae3787b0e36f9ae6a2d4ea5654 100644
--- a/internal/server/handler.go
+++ b/internal/server/handler.go
@@ -252,7 +252,7 @@ func fetchFileFromGrpc(ctx context.Context, fileId string, grpcAddress string) (
 }
 
 func writeMultipartResponse(w http.ResponseWriter, fileBuffer *bytes.Buffer) error {
-	w.Header().Set(contentTypeHeaderKey, "multipart/form-data")
+	w.Header().Set(contentTypeHeaderKey, "application/octet-stream")
 	w.Header().Set(contentDispositionHeaderKey, `attachment; filename="file"`)
 	w.WriteHeader(http.StatusOK)