diff --git a/collects/mzlib/port.ss b/collects/mzlib/port.ss
index 51ea75f..60a5107 100644
--- a/collects/mzlib/port.ss
+++ b/collects/mzlib/port.ss
@@ -1,7 +1,7 @@
 #lang mzscheme
 
 (require mzlib/etc
-         mzlib/contract
+         scheme/contract
          mzlib/list
          "private/port.ss")