diff --git a/ChangeLog b/ChangeLog
index 1cf8a5710..5788154a2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -114,6 +114,7 @@
 
 0.16.18 release
 
+	* enable TCP keepalive for socks5 connection for UDP associate
 	* fix python3 support
 	* fix bug in lt_donthave extension
 	* expose i2p_alert to python. cleaning up of i2p connection code
diff --git a/src/udp_socket.cpp b/src/udp_socket.cpp
index 13edf798a..270c73712 100644
--- a/src/udp_socket.cpp
+++ b/src/udp_socket.cpp
@@ -943,6 +943,10 @@ void udp_socket::on_allow_connect(int ticket)
 
 	error_code ec;
 	m_socks5_sock.open(m_proxy_addr.address().is_v4()?tcp::v4():tcp::v6(), ec);
+
+	// enable keepalives
+	m_socks5_sock.set_option(boost::asio::socket_base::keep_alive(true), ec);
+
 	++m_outstanding_ops;
 #if TORRENT_USE_ASSERTS
 	++m_outstanding_connect;
diff --git a/src/utp_stream.cpp b/src/utp_stream.cpp
index 3afb86360..4bf8cd5db 100644
--- a/src/utp_stream.cpp
+++ b/src/utp_stream.cpp
@@ -1803,7 +1803,7 @@ bool utp_socket_impl::send_pkt(int flags)
 		else
 			sack = 0;
 
-		int size_left = p->allocated - p->size;
+		boost::int32_t size_left = p->allocated - p->size;
 		TORRENT_ASSERT(size_left > 0);
 		size_left = (std::min)(size_left, m_write_buffer_size);
 		write_payload(p->buf + p->size, size_left);