diff --git a/ldisc.c b/ldisc.c
index 8eb80175..f097c040 100644
--- a/ldisc.c
+++ b/ldisc.c
@@ -130,7 +130,6 @@ void ldisc_send(Ldisc *ldisc, const void *vbuf, int len, bool interactive)
     int keyflag = 0;
 
     assert(ldisc->term);
-    assert(len);
 
     if (interactive) {
         /*