diff --git a/collects/mzlib/contract.ss b/collects/mzlib/contract.ss
index f0b0a67..9f69097 100644
--- a/collects/mzlib/contract.ss
+++ b/collects/mzlib/contract.ss
@@ -25,7 +25,6 @@
 (require scheme/private/contract
          scheme/private/contract-guts
          scheme/private/contract-ds
-         scheme/private/contract-opt-guts
          scheme/private/contract-opt
          scheme/private/contract-basic-opters)