diff --git a/extra/automata/ui/ui.factor b/extra/automata/ui/ui.factor
index 467db53366..cfec6597c2 100644
--- a/extra/automata/ui/ui.factor
+++ b/extra/automata/ui/ui.factor
@@ -15,7 +15,7 @@ USING: kernel namespaces math quotations arrays hashtables sequences threads
        ui.gadgets.grids
        ui.gadgets.theme
        namespaces.lib assocs.lib vars
-       rewrite-closures automata ;
+       rewrite-closures automata math.geometry.rect ;
 
 IN: automata.ui