diff --git a/types/google-cloud__storage/index.d.ts b/types/google-cloud__storage/index.d.ts
index 55f3b0d3d2..544f2e095f 100644
--- a/types/google-cloud__storage/index.d.ts
+++ b/types/google-cloud__storage/index.d.ts
@@ -134,7 +134,7 @@ declare namespace Storage {
         makePublic(): Promise<[ApiResponse]>;
         move(destination: string | Bucket | File): Promise<[File, ApiResponse]>;
         name: string;
-        save(data: string, options?: WriteStreamOptions): Promise<void>;
+        save(data: string | Buffer, options?: WriteStreamOptions): Promise<void>;
         setEncryptionKey(encryptionKey: string | Buffer): File;
         setMetadata(metadata: FileMetadata): Promise<[ApiResponse]>;
         metadata?: FileMetadata;