diff --git a/drivers/usb/serial/opticon.c b/drivers/usb/serial/opticon.c
index 2c9137c..543d8c7 100644
--- a/drivers/usb/serial/opticon.c
+++ b/drivers/usb/serial/opticon.c
@@ -492,7 +492,7 @@
 	if (!priv->bulk_read_urb)
 		goto error;
 
-	priv->buffer_size = 2 * port->bulk_in_size;
+	priv->buffer_size = port->bulk_in_size;
 	priv->bulk_in_buffer = kmalloc(priv->buffer_size, GFP_KERNEL);
 	if (!priv->bulk_in_buffer)
 		goto error;
@@ -559,6 +559,7 @@
 	},
 	.id_table =		id_table,
 	.num_ports =		1,
+	.bulk_in_size =		256,
 	.attach =		opticon_startup,
 	.port_probe =		opticon_port_probe,
 	.port_remove =		opticon_port_remove,