diff --git a/pkgs/compatibility-pkgs/compatibility-lib/mzlib/class.rkt b/pkgs/compatibility-pkgs/compatibility-lib/mzlib/class.rkt
index 4e2e272..27e53d4 100644
--- a/pkgs/compatibility-pkgs/compatibility-lib/mzlib/class.rkt
+++ b/pkgs/compatibility-pkgs/compatibility-lib/mzlib/class.rkt
@@ -1,3 +1,4 @@
-(module class mzscheme
-  (require racket/private/class-internal)
-  (provide-public-names))
+#lang racket/base
+(require racket/private/class-internal
+         racket/private/class-c-old)
+(provide-public-names)