diff --git a/extra/multi-methods/multi-methods.factor b/extra/multi-methods/multi-methods.factor
index 9a74cc65e8..42ade34186 100755
--- a/extra/multi-methods/multi-methods.factor
+++ b/extra/multi-methods/multi-methods.factor
@@ -1,7 +1,7 @@
 ! Copyright (C) 2008 Slava Pestov.
 ! See http://factorcode.org/license.txt for BSD license.
-USING: kernel math sequences vectors classes combinators
-arrays words assocs parser namespaces definitions
+USING: kernel math sequences vectors classes classes.algebra
+combinators arrays words assocs parser namespaces definitions
 prettyprint prettyprint.backend quotations arrays.lib
 debugger io compiler.units kernel.private effects ;
 IN: multi-methods