diff --git a/sys/net/vnet.h b/sys/net/vnet.h
index 86ddd444fc09..48c2536be8b4 100644
--- a/sys/net/vnet.h
+++ b/sys/net/vnet.h
@@ -407,6 +407,7 @@ do {									\
 #define	CURVNET_SET(arg)
 #define	CURVNET_SET_QUIET(arg)
 #define	CURVNET_RESTORE()
+#define	CURVNET_ASSERT_SET()						\
 
 #define	VNET_LIST_RLOCK()
 #define	VNET_LIST_RLOCK_NOSLEEP()