diff --git a/drivers/usb/serial/digi_acceleport.c b/drivers/usb/serial/digi_acceleport.c
index afaa62e257d0..8d320cce86fa 100644
--- a/drivers/usb/serial/digi_acceleport.c
+++ b/drivers/usb/serial/digi_acceleport.c
@@ -32,10 +32,6 @@
 /* so we can be sure to send the full buffer in one urb */
 #define DIGI_OUT_BUF_SIZE		8
 
-/* port input buffer length -- must be >= transfer buffer length - 3 */
-/* so we can be sure to hold at least one full buffer from one urb */
-#define DIGI_IN_BUF_SIZE		64
-
 /* retry timeout while sleeping */
 #define DIGI_RETRY_TIMEOUT		(HZ/10)