diff --git a/scheme/packages.scm b/scheme/packages.scm
index a176395..632a5b8 100644
--- a/scheme/packages.scm
+++ b/scheme/packages.scm
@@ -557,8 +557,7 @@
 
 (define-structure dns dns-interface
   (open scheme-with-scsh
-	big-util
-	srfi-1
+	(subset srfi-1 (filter reverse! delete lset-difference lset-union))
 	tables
 	ascii
 	formats