diff --git a/src/nf_nat_fullcone.c b/src/nf_nat_fullcone.c
index b60e31a679c..f48df4b93d2 100644
--- a/src/nf_nat_fullcone.c
+++ b/src/nf_nat_fullcone.c
@@ -1223,12 +1223,12 @@ static unsigned int nf_nat_handle_prerouting(u8 nfproto, struct sk_buff *skb, un
 	if (nfproto == NFPROTO_IPV4) {
 		newrange->min_addr.ip = mapping->int_addr;
 		newrange->max_addr.ip = mapping->int_addr;
+		newrange->min_proto.udp.port = cpu_to_be16(mapping->int_port);
 	} else if (nfproto == NFPROTO_IPV6) {
 		newrange->min_addr = mapping_6->int_addr;
 		newrange->max_addr = mapping_6->int_addr;
+		newrange->min_proto.udp.port = cpu_to_be16(mapping_6->int_port);
 	}
-
-	newrange->min_proto.udp.port = cpu_to_be16(mapping->int_port);
 	newrange->max_proto = newrange->min_proto;
 
 	if (nfproto == NFPROTO_IPV4) {