diff --git a/sys/kernel/vfs_calls.c b/sys/kernel/vfs_calls.c
index f3656be..d5e1bd3 100644
--- a/sys/kernel/vfs_calls.c
+++ b/sys/kernel/vfs_calls.c
@@ -341,8 +341,10 @@
 
         break;
       default:
-        if (fd->fd)
+        if (fd->fd) {
+          kprintf("[0x%X]", fd->fd->res);
           td->td_retval[0] = fwrite(uap->buf, uap->nbyte, 1, fd->fd);
+        }
         else {
           kprintf("[%i]", uap->nbyte);
           buffer = kmalloc(uap->nbyte);