diff --git a/share/examples/modules/Makefile b/share/examples/modules/Makefile
index bc7f6f6a57ac..4ed5e5354c79 100644
--- a/share/examples/modules/Makefile
+++ b/share/examples/modules/Makefile
@@ -1,8 +1,8 @@
 .PATH: ${SRCTOP}/sys/skel
 
 KMOD=	skel
 SRCS=	skel.c
 
 .include <bsd.kmod.mk>
 
-CFLAGS:= ${CFLAGS:N -DKDTRACE_HOOKS}
+CFLAGS+= -DKDTRACE_HOOKS