--- a/admswconfig.c
+++ b/admswconfig.c
@@ -68,7 +68,7 @@ int main(int argc, char **argv)
 		return 1;
 	}
 	strcpy(ifr.ifr_name, device);
-	ifr.ifr_data = (caddr_t)&info;
+	ifr.ifr_data = (void *)&info;
 	if (ioctl(fd, SIOCGADMINFO, &ifr) < 0) {
 		perror("SIOCGADMINFO");
 		return 1;