diff --git a/arch/sim/src/up_tapdev.c b/arch/sim/src/up_tapdev.c
index dd7cbde2c54..f07b118e6e1 100644
--- a/arch/sim/src/up_tapdev.c
+++ b/arch/sim/src/up_tapdev.c
@@ -198,7 +198,7 @@ void tapdev_init(void)
     struct ifreq ifr;
     memset(&ifr, 0, sizeof(ifr));
     ifr.ifr_flags = IFF_TAP|IFF_NO_PI;
-    if (up_ioctl(gtapdevfd, TUNSETIFF, (void *) &ifr) < 0)
+    if (up_ioctl(gtapdevfd, TUNSETIFF, (unsigned long *) &ifr) < 0)
       {
         lib_rawprintf(buf);
         return;
diff --git a/arch/sim/src/up_uipdriver.c b/arch/sim/src/up_uipdriver.c
index ea6d349aecd..a54063ea26c 100644
--- a/arch/sim/src/up_uipdriver.c
+++ b/arch/sim/src/up_uipdriver.c
@@ -145,7 +145,7 @@ void uipdriver_loop(void)
       timer_reset(&periodic_timer);
       for(i = 0; i < UIP_CONNS; i++)
         {
-          uip_periodic(i);
+          uip_tcppoll(i);
 
           /* If the above function invocation resulted in data that
            * should be sent out on the network, the global variable