diff --git a/extra/match/match.factor b/extra/match/match.factor
index a80001e724..421aa926f9 100755
--- a/extra/match/match.factor
+++ b/extra/match/match.factor
@@ -3,7 +3,7 @@
 !
 ! Based on pattern matching code from Paul Graham's book 'On Lisp'.
 USING: parser kernel words namespaces sequences tuples
-combinators macros assocs ;
+combinators macros assocs math ;
 IN: match
 
 SYMBOL: _