diff --git a/drivers/usb/class/cdc-acm.h b/drivers/usb/class/cdc-acm.h
index b519138364093943f3f0dc72fa36ab8b12194ec7..7a2b3deafc90abc3d524463d32b49172a7778695 100644
--- a/drivers/usb/class/cdc-acm.h
+++ b/drivers/usb/class/cdc-acm.h
@@ -101,7 +101,6 @@ struct acm {
 	u8 *notification_buffer;			/* to reassemble fragmented notifications */
 	unsigned int nb_index;
 	unsigned int nb_size;
-	int write_used;					/* number of non-empty write buffers */
 	int transmitting;
 	spinlock_t write_lock;
 	struct mutex mutex;