diff --git a/drivers/usb/net/Makefile b/drivers/usb/net/Makefile
index 222c049..a21e6ea 100644
--- a/drivers/usb/net/Makefile
+++ b/drivers/usb/net/Makefile
@@ -16,3 +16,7 @@
 obj-$(CONFIG_USB_NET_ZAURUS)	+= zaurus.o
 obj-$(CONFIG_USB_USBNET)	+= usbnet.o
 obj-$(CONFIG_USB_ZD1201)	+= zd1201.o
+
+ifeq ($(CONFIG_USB_DEBUG),y)
+EXTRA_CFLAGS += -DDEBUG
+endif