diff --git a/src/bin/tyfuzz.c b/src/bin/tyfuzz.c
index 454a8dab..e9e85cd2 100644
--- a/src/bin/tyfuzz.c
+++ b/src/bin/tyfuzz.c
@@ -84,6 +84,10 @@ _termpty_init(Termpty *ty)
    ty->fd = STDIN_FILENO;
    ty->fd_dev_null = open("/dev/null", O_WRONLY|O_APPEND);
    assert(ty->fd_dev_null >= 0);
+   ty->hl.bitmap = calloc(1, HL_LINKS_MAX / 8); /* bit map for 1 << 16 elements */
+   assert(ty->hl.bitmap);
+   /* Mark id 0 as set */
+   ty->hl.bitmap[0] = 1;
 }
 
 static void