diff --git a/s48/args-fold/pkg-def.scm b/s48/args-fold/pkg-def.scm
index cd01650..0b37e67 100644
--- a/s48/args-fold/pkg-def.scm
+++ b/s48/args-fold/pkg-def.scm
@@ -1,5 +1,5 @@
 (define-package "srfi-37"
-  (0 6)
+  (0 4)
   ()
   (install-file "load.scm" 'base)
   (install-file "README" 'doc)