diff --git a/collects/typed-scheme/private/free-variance.ss b/collects/typed-scheme/private/free-variance.ss
index 151fe78104..134c71400e 100644
--- a/collects/typed-scheme/private/free-variance.ss
+++ b/collects/typed-scheme/private/free-variance.ss
@@ -62,7 +62,6 @@
 ;; given a set of free variables, remove bound, add bound ...
 (define (fix-bound vs bound)
   (define vs* (hash-map* (lambda (k v) v) vs))
-  (hash-remove! vs* bound)
   (hash-set! vs* bound Dotted)
   vs*)