diff --git a/src/proto_tcp.c b/src/proto_tcp.c
index 06adf9b..e8e6c76 100644
--- a/src/proto_tcp.c
+++ b/src/proto_tcp.c
@@ -743,7 +743,7 @@
 		return;
 	listener_set_state(listener, LI_ASSIGNED);
 	listener->rx.proto = &proto_tcpv6;
-	((struct sockaddr_in *)(&listener->rx.addr))->sin_port = htons(port);
+	((struct sockaddr_in6 *)(&listener->rx.addr))->sin6_port = htons(port);
 	LIST_ADDQ(&proto_tcpv6.receivers, &listener->rx.proto_list);
 	proto_tcpv6.nb_receivers++;
 }
diff --git a/src/proto_udp.c b/src/proto_udp.c
index ae5562a..e38ab0d 100644
--- a/src/proto_udp.c
+++ b/src/proto_udp.c
@@ -167,7 +167,7 @@
 		return;
 	listener_set_state(listener, LI_ASSIGNED);
 	listener->rx.proto = &proto_udp6;
-	((struct sockaddr_in *)(&listener->rx.addr))->sin_port = htons(port);
+	((struct sockaddr_in6 *)(&listener->rx.addr))->sin6_port = htons(port);
 	LIST_ADDQ(&proto_udp6.receivers, &listener->rx.proto_list);
 	proto_udp6.nb_receivers++;
 }