diff --git a/collects/drscheme/private/unit.ss b/collects/drscheme/private/unit.ss
index fdf62a5409..28376eb5c7 100644
--- a/collects/drscheme/private/unit.ss
+++ b/collects/drscheme/private/unit.ss
@@ -954,7 +954,7 @@ module browser threading seems wrong.
              (string-constant kill)
              (string-constant kill?)
              'diallow-close
-             this))
+             frame))
           
           ;; reset-offer-kill
           (define/public (reset-offer-kill)