diff --git a/arch/sim/src/up_tapdev.c b/arch/sim/src/up_tapdev.c
index 0fe0d890f18..4fc1394e377 100644
--- a/arch/sim/src/up_tapdev.c
+++ b/arch/sim/src/up_tapdev.c
@@ -167,7 +167,7 @@ static int up_setmacaddr(void)
         {
           /* Set the MAC address */
 
-          ret = netdriver_setmacaddr(&req.ifr_hwaddr.sa_data);
+          ret = netdriver_setmacaddr((unsigned char *)&req.ifr_hwaddr.sa_data);
         }
     }