Index: head/sys/kern/tty_compat.c
===================================================================
--- head/sys/kern/tty_compat.c
+++ head/sys/kern/tty_compat.c
@@ -262,9 +262,11 @@
 			fflag, td));
 	    }
 
-	case OTIOCCONS:
-		*(int *)data = 1;
-		return (tty_ioctl(tp, TIOCCONS, data, fflag, td));
+	case OTIOCCONS: {
+		int one = 1;
+
+		return (tty_ioctl(tp, TIOCCONS, (caddr_t)&one, fflag, td));
+	}
 
 	default:
 		return (ENOIOCTL);