assocs.extras: fix using.

diff --git a/extra/assocs/extras/extras.factor b/extra/assocs/extras/extras.factor
index 43ae4121e72b57247d68f33c8ec538a4bfd43cf4..ac5150ad44bd7b2a6dc58537042aff821ff223b0 100644 (file)
--- a/extra/assocs/extras/extras.factor
+++ b/extra/assocs/extras/extras.factor
@@ -1,7 +1,7 @@
 ! Copyright (C) 2012 John Benediktsson, Doug Coleman
 ! See http://factorcode.org/license.txt for BSD license
 
-USING: arrays assocs assocs.private kernel sequences ;
+USING: arrays assocs assocs.private kernel math sequences ;
 
 IN: assocs.extras