diff --git a/include/libnetlink.h b/include/libnetlink.h
index 40587a0..41a3965 100644
--- a/include/libnetlink.h
+++ b/include/libnetlink.h
@@ -35,6 +35,7 @@
 
 extern int addattr32(struct nlmsghdr *n, int maxlen, int type, __u32 data);
 extern int addattr_l(struct nlmsghdr *n, int maxlen, int type, const void *data, int alen);
+extern int addraw_l(struct nlmsghdr *n, int maxlen, const void *data, int len);
 extern int rta_addattr32(struct rtattr *rta, int maxlen, int type, __u32 data);
 extern int rta_addattr_l(struct rtattr *rta, int maxlen, int type, const void *data, int alen);