diff --git a/sys/dev/usb/ucom.c b/sys/dev/usb/ucom.c
index 82832ca151ad..f93e33c738c7 100644
--- a/sys/dev/usb/ucom.c
+++ b/sys/dev/usb/ucom.c
@@ -414,11 +414,9 @@ ucom_detach(device_t self, int flags)
 
 	if (sc->sc_bulkin_pipe != NULL) {
 		usbd_abort_pipe(sc->sc_bulkin_pipe);
-		sc->sc_bulkin_pipe = NULL;
 	}
 	if (sc->sc_bulkout_pipe != NULL) {
 		usbd_abort_pipe(sc->sc_bulkout_pipe);
-		sc->sc_bulkout_pipe = NULL;
 	}
 
 	mutex_enter(&sc->sc_lock);