diff --git a/ft2232_spi.c b/ft2232_spi.c
index d63aa8d..ee19eef 100644
--- a/ft2232_spi.c
+++ b/ft2232_spi.c
@@ -386,7 +386,7 @@
 		msg_perr("Unable to set latency timer (%s).\n", ftdi_get_error_string(ftdic));
 	}
 
-	if (ftdi_write_data_set_chunksize(ftdic, 256)) {
+	if (ftdi_write_data_set_chunksize(ftdic, 270)) {
 		msg_perr("Unable to set chunk size (%s).\n", ftdi_get_error_string(ftdic));
 	}