diff --git a/extra/tools/dns/dns.factor b/extra/tools/dns/dns.factor
index 47d4167eea..3f730ba3a9 100644
--- a/extra/tools/dns/dns.factor
+++ b/extra/tools/dns/dns.factor
@@ -1,6 +1,7 @@
 ! Copyright (C) 2010 Doug Coleman.
 ! See http://factorcode.org/license.txt for BSD license.
-USING: arrays dns fry io kernel math.parser sequences ;
+USING: arrays dns fry io kernel math.parser sequences
+strings ;
 IN: tools.dns
 
 : a-line. ( host ip -- )