diff --git a/net/ipv4/netfilter/nf_nat_proto_udp.c b/net/ipv4/netfilter/nf_nat_proto_udp.c
index 9e61c79..dfe65c7 100644
--- a/net/ipv4/netfilter/nf_nat_proto_udp.c
+++ b/net/ipv4/netfilter/nf_nat_proto_udp.c
@@ -19,14 +19,13 @@
 
 static u_int16_t udp_port_rover;
 
-static bool
+static void
 udp_unique_tuple(struct nf_conntrack_tuple *tuple,
 		 const struct nf_nat_range *range,
 		 enum nf_nat_manip_type maniptype,
 		 const struct nf_conn *ct)
 {
-	return nf_nat_proto_unique_tuple(tuple, range, maniptype, ct,
-					 &udp_port_rover);
+	nf_nat_proto_unique_tuple(tuple, range, maniptype, ct, &udp_port_rover);
 }
 
 static bool