diff --git a/collects/macro-debugger/syntax-browser/frame.ss b/collects/macro-debugger/syntax-browser/frame.ss
index f729d03..e6a6af2 100644
--- a/collects/macro-debugger/syntax-browser/frame.ss
+++ b/collects/macro-debugger/syntax-browser/frame.ss
@@ -47,7 +47,6 @@
             (pref:width (send this get-width))
             (pref:height (send this get-height))
             (send widget save-prefs)
-            (preferences:save)
             (inner (void) on-close))
           ))