diff --git a/src/session_impl.cpp b/src/session_impl.cpp
index a29d9d3fe..df490bd9d 100644
--- a/src/session_impl.cpp
+++ b/src/session_impl.cpp
@@ -738,7 +738,10 @@ namespace aux {
 		PRINT_OFFSETOF(udp_socket, m_v6_buf)
 #endif
 		PRINT_OFFSETOF(udp_socket, m_bind_port)
-		PRINT_OFFSETOF(udp_socket, m_outstanding)
+		PRINT_OFFSETOF(udp_socket, m_v4_outstanding)
+#if TORRENT_USE_IPV6
+		PRINT_OFFSETOF(udp_socket, m_v6_outstanding)
+#endif
 		PRINT_OFFSETOF(udp_socket, m_socks5_sock)
 		PRINT_OFFSETOF(udp_socket, m_connection_ticket)
 		PRINT_OFFSETOF(udp_socket, m_proxy_settings)