diff --git a/extra/nested-comments/nested-comments.factor b/extra/nested-comments/nested-comments.factor
index 93cc1be1b0..393b98f62b 100644
--- a/extra/nested-comments/nested-comments.factor
+++ b/extra/nested-comments/nested-comments.factor
@@ -1,6 +1,6 @@
 ! Copyright (C) 2009 blei, Doug Coleman.
 ! See http://factorcode.org/license.txt for BSD license.
-USING: kernel sequences math locals make ;
+USING: kernel locals make math multiline sequences ;
 IN: nested-comments
 
 : (count-subsequences) ( count substring string n -- count' )