diff --git a/sys/modules/iwn/Makefile b/sys/modules/iwn/Makefile
index 3473776476de..afc5c5176d6b 100644
--- a/sys/modules/iwn/Makefile
+++ b/sys/modules/iwn/Makefile
@@ -3,6 +3,6 @@
 .PATH:  ${.CURDIR}/../../dev/iwn
 
 KMOD    = if_iwn
-SRCS    = if_iwn.c opt_bdg.h device_if.h bus_if.h pci_if.h
-CFLAGS += -g -DWITNESS -DINVARIANT_SUPPORT -DINVARIANTS -I${.CURDIR}/../../ 
+SRCS    = if_iwn.c device_if.h bus_if.h pci_if.h
+
 .include <bsd.kmod.mk>