diff --git a/sgml/catalog b/sgml/catalog
index cca7a1e..09be047 100644
--- a/sgml/catalog
+++ b/sgml/catalog
@@ -5,5 +5,4 @@ CATALOG "/etc/sgml/xml-docbook-4.5.cat"
 CATALOG "/etc/sgml/sgml-ent.cat"
 CATALOG "/etc/sgml/xml-docbook-4.1.2.cat"
 CATALOG "/etc/sgml/xml-docbook-4.3.cat"
-CATALOG "/etc/sgml/sgml-docbook-3.1.cat"
 CATALOG "/etc/sgml/openjade-1.3.2.cat"
diff --git a/sgml/sgml-docbook-3.1.cat b/sgml/sgml-docbook-3.1.cat
deleted file mode 100644
index f0ea203..0000000
--- a/sgml/sgml-docbook-3.1.cat
+++ /dev/null
@@ -1,2 +0,0 @@
-CATALOG "/usr/share/sgml/docbook/sgml-dtd-3.1/catalog"
-CATALOG "/etc/sgml/sgml-docbook.cat"