diff --git a/en_US.ISO8859-1/share/sgml/mailing-lists.ent b/en_US.ISO8859-1/share/sgml/mailing-lists.ent
index 53694fa1ea..d818e074b5 100644
--- a/en_US.ISO8859-1/share/sgml/mailing-lists.ent
+++ b/en_US.ISO8859-1/share/sgml/mailing-lists.ent
@@ -160,10 +160,6 @@
 <!ENTITY a.hubs "<ulink url='&a.hubs.url;'>FreeBSD mirror sites mailing lists</ulink>">
 <!ENTITY a.hubs.name "<ulink url='&a.hubs.url;'>freebsd-hubs</ulink>">
 
-<!ENTITY a.isdn.url "&a.mailman.listinfo;/freebsd-isdn">
-<!ENTITY a.isdn "<ulink url='&a.isdn.url;'>FreeBSD ISDN support mailing list</ulink>">
-<!ENTITY a.isdn.name "<ulink url='&a.isdn.url;'>freebsd-isdn</ulink>">
-
 <!ENTITY a.i18n.url "&a.mailman.listinfo;/freebsd-i18n">
 <!ENTITY a.i18n "<ulink url='&a.i18n.url;'>FreeBSD internationalization mailing list</ulink>">
 <!ENTITY a.i18n.name "<ulink url='&a.i18n.url;'>freebsd-i18n</ulink>">