diff --git a/sftp.go b/sftp.go
index 6b1c031..a886d24 100644
--- a/sftp.go
+++ b/sftp.go
@@ -33,7 +33,7 @@ func SftpTransferOut(localFilePath, remotePath string, sftpClient *sftp.Client)
 	}
 	defer dstFile.Close()
 	for {
-		buf := make([]byte, 1024)
+		buf := make([]byte, 1048576)
 		n, err := srcFile.Read(buf)
 		dstFile.Write(buf[:n])
 		if err == io.EOF {