diff -up nut-2.2.1/drivers/megatec_usb.c.open nut-2.2.1/drivers/megatec_usb.c
--- nut-2.2.1/drivers/megatec_usb.c.open 2008-01-09 14:22:27.000000000 +0100
+++ nut-2.2.1/drivers/megatec_usb.c 2008-01-09 14:23:00.000000000 +0100
@@ -207,7 +207,7 @@ int ser_open(const char *port)
/* link the matchers */
regex_matcher->next = &subdriver_matcher;
- ret = usb->open(&udev, &usbdevice, regex_matcher, NULL);
+ ret = (usb->open)(&udev, &usbdevice, regex_matcher, NULL);
if (ret < 0)
usb_open_error(port);