diff --git a/collects/mzlib/contract.rkt b/collects/mzlib/contract.rkt
index e9a8146..462ff7c 100644
--- a/collects/mzlib/contract.rkt
+++ b/collects/mzlib/contract.rkt
@@ -40,7 +40,8 @@
 (provide 
  opt/c define-opt/c ;(all-from "private/contract-opt.rkt")
  (except-out (all-from-out racket/contract/private/ds)
-             lazy-depth-to-look)
+             lazy-depth-to-look
+             contract-struct)
  
  (all-from-out racket/contract/private/base)
  (all-from-out racket/contract/private/provide)