diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 7552b50..aa18230 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -118,8 +118,7 @@
 struct hlist_head udp_hash[UDP_HTABLE_SIZE];
 DEFINE_RWLOCK(udp_hash_lock);
 
-/* Shared by v4/v6 udp_get_port */
-int udp_port_rover;
+static int udp_port_rover;
 
 static inline int udp_lport_inuse(u16 num)
 {