diff --git a/ft2232_spi.c b/ft2232_spi.c
index 0ffe1ce..30eff42 100644
--- a/ft2232_spi.c
+++ b/ft2232_spi.c
@@ -195,7 +195,7 @@
 		msg_perr("Unable to set latency timer\n");
 	}
 
-	if (ftdi_write_data_set_chunksize(ftdic, 512)) {
+	if (ftdi_write_data_set_chunksize(ftdic, 256)) {
 		msg_perr("Unable to set chunk size\n");
 	}