diff --git a/extra/concurrency/concurrency-docs.factor b/extra/concurrency/concurrency-docs.factor
index 39e8b277e3..e1377f5265 100644
--- a/extra/concurrency/concurrency-docs.factor
+++ b/extra/concurrency/concurrency-docs.factor
@@ -1,6 +1,6 @@
 ! Copyright (C) 2006 Chris Double.
 ! See http://factorcode.org/license.txt for BSD license.
-USING: help.syntax help.markup concurrency concurrency.private match ;
+USING: help.syntax help.markup concurrency.private match ;
 IN: concurrency
 
 HELP: make-mailbox
@@ -168,4 +168,4 @@ ARTICLE: { "concurrency" "concurrency" } "Concurrency"
 { $subsection { "concurrency" "futures" } } 
 { $subsection { "concurrency" "promises" } } ;
 
-ABOUT: { "concurrency" "concurrency" }
\ No newline at end of file
+ABOUT: { "concurrency" "concurrency" }