diff -up gnumeric-1.12.33/doc/C/gnumeric.xml.docbook gnumeric-1.12.33/doc/C/gnumeric.xml
--- gnumeric-1.12.33/doc/C/gnumeric.xml.docbook	2017-02-01 03:58:38.893646538 +0100
+++ gnumeric-1.12.33/doc/C/gnumeric.xml	2017-02-01 04:05:40.111116668 +0100
@@ -47,17 +47,17 @@
 
   <!-- For mdash, hellip and friends -->
   <!ENTITY % isopub PUBLIC "ISO 8879:1986//ENTITIES Publishing//EN//XML"
-           "http://www.oasis-open.org/docbook/xmlcharent/0.3/iso-pub.ent">
+           "http://www.oasis-open.org/docbook/xml/4.5/ent/isopub.ent">
   %isopub;
 
   <!-- For nbsp, pound, yen and friends -->
   <!ENTITY % isonum PUBLIC "ISO 8879:1986//ENTITIES Numeric and Special Graphic//EN//XML"
-           "http://www.oasis-open.org/docbook/xmlcharent/0.3/iso-num.ent">
+           "http://www.oasis-open.org/docbook/xml/4.5/ent/isonum.ent">
   %isonum;
 
   <!-- Character entity to provide greek letters in simulation chapter -->
   <!ENTITY % isogrk1 PUBLIC "ISO 8879:1986//ENTITIES Greek Letters//EN//XML"
-           "http://www.oasis-open.org/docbook/xmlcharent/0.3/iso-grk1.ent">
+           "http://www.oasis-open.org/docbook/xml/4.5/ent/isogrk1.ent">
   %isogrk1;
 
   <!ENTITY legal                SYSTEM "legal.xml">