diff --git a/collects/mzlib/contracts.ss b/collects/mzlib/contracts.ss
index 0be524b..df91a41 100644
--- a/collects/mzlib/contracts.ss
+++ b/collects/mzlib/contracts.ss
@@ -50,7 +50,7 @@
             ;; this is here to check for unbound ids.
             ;; put outer `void' just in case we start printing out module
             ;; body values (say in the module language or something)
-            ;(begin (begin (void) id ...) (void)) 
+	    (if #f (begin (void) id ...))
 
 	    (define contract-id ctrct) ...
             (define-syntax id-rename