diff --git a/net/ipv4/fib_lookup.h b/net/ipv4/fib_lookup.h
index b75db4dcbf5e0039aac2d870148363e9ab6ea074..aff454ef0fa38e38a20da42d7cf8d08389a0fc0e 100644
--- a/net/ipv4/fib_lookup.h
+++ b/net/ipv4/fib_lookup.h
@@ -42,6 +42,7 @@ int fib_dump_info(struct sk_buff *skb, u32 pid, u32 seq, int event,
 		  const struct fib_rt_info *fri, unsigned int flags);
 void rtmsg_fib(int event, __be32 key, struct fib_alias *fa, int dst_len,
 	       u32 tb_id, const struct nl_info *info, unsigned int nlm_flags);
+size_t fib_nlmsg_size(struct fib_info *fi);
 
 static inline void fib_result_assign(struct fib_result *res,
 				     struct fib_info *fi)
diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index dba56fa5e2cdaa47eae47ed758ccc1dc7fc1a317..4c38facf91c0f4ce307fccd6668973a6caf4e916 100644
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -452,7 +452,7 @@ int ip_fib_check_default(__be32 gw, struct net_device *dev)
 	return -1;
 }
 
-static inline size_t fib_nlmsg_size(struct fib_info *fi)
+size_t fib_nlmsg_size(struct fib_info *fi)
 {
 	size_t payload = NLMSG_ALIGN(sizeof(struct rtmsg))
 			 + nla_total_size(4) /* RTA_TABLE */