diff --git a/src/network/core/udp.cpp b/src/network/core/udp.cpp
index 31ae8a4460..110cec2f23 100644
--- a/src/network/core/udp.cpp
+++ b/src/network/core/udp.cpp
@@ -101,6 +101,8 @@ void NetworkUDPSocketHandler::SendPacket(Packet *p, NetworkAddress *recv)
 void NetworkUDPSocketHandler::ReceivePackets()
 {
 	struct sockaddr_storage client_addr;
+	memset(&client_addr, 0, sizeof(client_addr));
+
 	socklen_t client_len;
 	int nbytes;
 	Packet p(this);
diff --git a/src/network/network.cpp b/src/network/network.cpp
index e88b7a1f87..ebd10980dc 100644
--- a/src/network/network.cpp
+++ b/src/network/network.cpp
@@ -480,6 +480,7 @@ static void NetworkAcceptClients()
 	assert(_listensocket != INVALID_SOCKET);
 
 	for (;;) {
+		memset(&sin, 0, sizeof(sin));
 		socklen_t sin_len = sizeof(sin);
 		SOCKET s = accept(_listensocket, (struct sockaddr*)&sin, &sin_len);
 		if (s == INVALID_SOCKET) return;