diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index a6b2289..090c690 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -2278,7 +2278,7 @@
 
 EXPORT_SYMBOL(tcp_free_md5sig_pool);
 
-struct tcp_md5sig_pool **__tcp_alloc_md5sig_pool(void)
+static struct tcp_md5sig_pool **__tcp_alloc_md5sig_pool(void)
 {
 	int cpu;
 	struct tcp_md5sig_pool **pool;