diff --git a/collects/typed-scheme/optimizer/tool/tool.rkt b/collects/typed-scheme/optimizer/tool/tool.rkt
index 8453cae3c2..f301180009 100644
--- a/collects/typed-scheme/optimizer/tool/tool.rkt
+++ b/collects/typed-scheme/optimizer/tool/tool.rkt
@@ -43,7 +43,7 @@
                    (min 255 (- max-g (* (sub1 x) bucket-size-g)))
                    (min 255 (- max-b (* (sub1 x) bucket-size-b)))))))
 
-(define remove-highlights-mixin
+(define highlights-mixin
   (mixin ((class->interface text%)) ()
     (inherit begin-edit-sequence
              end-edit-sequence
@@ -178,7 +178,7 @@
   (export drracket:tool-exports^)
   (define (phase1) (void))
   (define (phase2) (void))
-  (drracket:get/extend:extend-definitions-text remove-highlights-mixin))
+  (drracket:get/extend:extend-definitions-text highlights-mixin))
 
 (define performance-report-drracket-button
   (list