diff --git a/slirp/tftp.c b/slirp/tftp.c
index 55e4692..a455ad1 100644
--- a/slirp/tftp.c
+++ b/slirp/tftp.c
@@ -311,7 +311,7 @@ static void tftp_handle_rrq(Slirp *slirp, struct tftp_t *tp, int pktlen)
     return;
   }
 
-  if (memcmp(&tp->x.tp_buf[k], "octet\0", 6) != 0) {
+  if (strcasecmp((const char *)&tp->x.tp_buf[k], "octet") != 0) {
       tftp_send_error(spt, 4, "Unsupported transfer mode", tp);
       return;
   }