diff --git a/slirp/if.c b/slirp/if.c
index 67a7b6ff82..361d7f3640 100644
--- a/slirp/if.c
+++ b/slirp/if.c
@@ -291,7 +291,7 @@ if_start(void)
 	}
 
 	/* Encapsulate the packet for sending */
-        if_encap(ifm->m_data, ifm->m_len);
+        if_encap((uint8_t *)ifm->m_data, ifm->m_len);
 
         m_free(ifm);
 
diff --git a/slirp/misc.c b/slirp/misc.c
index 14808fe21d..337f8a8574 100644
--- a/slirp/misc.c
+++ b/slirp/misc.c
@@ -304,7 +304,7 @@ fork_exec(struct socket *so, const char *ex, int do_pty)
 {
 	int s;
 	struct sockaddr_in addr;
-	int addrlen = sizeof(addr);
+	socklen_t addrlen = sizeof(addr);
 	int opt;
         int master = -1;
 	char *argv[256];
diff --git a/slirp/socket.c b/slirp/socket.c
index 0c15132eae..75003af153 100644
--- a/slirp/socket.c
+++ b/slirp/socket.c
@@ -392,7 +392,7 @@ sorecvfrom(so)
 	struct socket *so;
 {
 	struct sockaddr_in addr;
-	int addrlen = sizeof(struct sockaddr_in);
+	socklen_t addrlen = sizeof(struct sockaddr_in);
 
 	DEBUG_CALL("sorecvfrom");
 	DEBUG_ARG("so = %lx", (long)so);
@@ -545,7 +545,8 @@ solisten(port, laddr, lport, flags)
 {
 	struct sockaddr_in addr;
 	struct socket *so;
-	int s, addrlen = sizeof(addr), opt = 1;
+	int s, opt = 1;
+	socklen_t addrlen = sizeof(addr);
 
 	DEBUG_CALL("solisten");
 	DEBUG_ARG("port = %d", port);
diff --git a/slirp/udp.c b/slirp/udp.c
index 3f0c08b3b1..0583d7e979 100644
--- a/slirp/udp.c
+++ b/slirp/udp.c
@@ -322,7 +322,7 @@ int udp_output(struct socket *so, struct mbuf *m,
         if ((so->so_faddr.s_addr & htonl(0x000000ff)) == htonl(0xff))
             saddr.sin_addr.s_addr = alias_addr.s_addr;
         else if (addr->sin_addr.s_addr == loopback_addr.s_addr ||
-                 ((so->so_faddr.s_addr & htonl(CTL_DNS)) == htonl(CTL_DNS)))
+                 (ntohl(so->so_faddr.s_addr) & 0xff) != CTL_ALIAS)
             saddr.sin_addr.s_addr = so->so_faddr.s_addr;
     }
     daddr.sin_addr = so->so_laddr;
@@ -410,7 +410,7 @@ static void
 udp_emu(struct socket *so, struct mbuf *m)
 {
 	struct sockaddr_in addr;
-        int addrlen = sizeof(addr);
+	socklen_t addrlen = sizeof(addr);
 #ifdef EMULATE_TALK
 	CTL_MSG_OLD *omsg;
 	CTL_MSG *nmsg;
@@ -641,7 +641,7 @@ udp_listen(port, laddr, lport, flags)
 {
 	struct sockaddr_in addr;
 	struct socket *so;
-	int addrlen = sizeof(struct sockaddr_in), opt = 1;
+	socklen_t addrlen = sizeof(struct sockaddr_in), opt = 1;
 
 	if ((so = socreate()) == NULL) {
 		free(so);