diff --git a/slirp/socket.c b/slirp/socket.c
index 8a257acc8..eaad77af8 100644
--- a/slirp/socket.c
+++ b/slirp/socket.c
@@ -587,6 +587,7 @@ tcp_listen(Slirp *slirp, u_int32_t haddr, u_int hport, u_int32_t laddr,
 	struct socket *so;
 	int s, opt = 1;
 	socklen_t addrlen = sizeof(addr);
+	memset(&addr, 0, addrlen);
 
 	DEBUG_CALL("tcp_listen");
 	DEBUG_ARG("haddr = %x", haddr);