diff --git a/collects/framework/main.ss b/collects/framework/main.ss
index e75f8e89..3c2230e0 100644
--- a/collects/framework/main.ss
+++ b/collects/framework/main.ss
@@ -52,7 +52,7 @@
                  make-object mixin
 		 define-some do opt-lambda send*
 		 local catch shared
-		 unit/sig
+		 unit/sig unit/lang
 		 with-handlers
 		 interface
 		 parameterize