--- moreutils/errno.docbook
+++ moreutils/errno.docbook
@@ -21,7 +21,7 @@
 -->
 
 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook V4.4//EN"
-"file:///usr/share/xml/docbook/schema/dtd/4.4/docbookx.dtd"
+"file://@GENTOO_PORTAGE_EPREFIX@/usr/share/sgml/docbook/xml-dtd-4.4/docbookx.dtd"
 []>
 
 <refentry>
--- moreutils/ifdata.docbook
+++ moreutils/ifdata.docbook
@@ -21,7 +21,7 @@
 -->
 
 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook V4.4//EN"
-"file:///usr/share/xml/docbook/schema/dtd/4.4/docbookx.dtd"
+"file://@GENTOO_PORTAGE_EPREFIX@/usr/share/sgml/docbook/xml-dtd-4.4/docbookx.dtd"
 []>
 
 <refentry>
--- moreutils/ifne.docbook
+++ moreutils/ifne.docbook
@@ -21,7 +21,7 @@
 -->
 
 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook V4.4//EN"
-"file:///usr/share/xml/docbook/schema/dtd/4.4/docbookx.dtd"
+"file://@GENTOO_PORTAGE_EPREFIX@/usr/share/sgml/docbook/xml-dtd-4.4/docbookx.dtd"
 []>
 
 <refentry>
--- moreutils/isutf8.docbook
+++ moreutils/isutf8.docbook
@@ -21,7 +21,7 @@
 -->
 
 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook V4.4//EN"
-"file:///usr/share/xml/docbook/schema/dtd/4.4/docbookx.dtd"
+"file://@GENTOO_PORTAGE_EPREFIX@/usr/share/sgml/docbook/xml-dtd-4.4/docbookx.dtd"
 []>
 
 <refentry>
--- moreutils/lckdo.docbook
+++ moreutils/lckdo.docbook
@@ -8,7 +8,7 @@
 -->
 
 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook V4.4//EN"
-"file:///usr/share/xml/docbook/schema/dtd/4.4/docbookx.dtd"
+"file://@GENTOO_PORTAGE_EPREFIX@/usr/share/sgml/docbook/xml-dtd-4.4/docbookx.dtd"
 []>
 
 <refentry>
--- moreutils/mispipe.docbook
+++ moreutils/mispipe.docbook
@@ -21,7 +21,7 @@
 -->
 
 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook V4.4//EN"
-"file:///usr/share/xml/docbook/schema/dtd/4.4/docbookx.dtd"
+"file://@GENTOO_PORTAGE_EPREFIX@/usr/share/sgml/docbook/xml-dtd-4.4/docbookx.dtd"
 []>
 
 <refentry>
--- moreutils/parallel.docbook
+++ moreutils/parallel.docbook
@@ -7,7 +7,7 @@
 -->
 
 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook V4.4//EN"
-"file:///usr/share/xml/docbook/schema/dtd/4.4/docbookx.dtd"
+"file://@GENTOO_PORTAGE_EPREFIX@/usr/share/sgml/docbook/xml-dtd-4.4/docbookx.dtd"
 []>
 
 <refentry>
--- moreutils/pee.docbook
+++ moreutils/pee.docbook
@@ -21,7 +21,7 @@
 -->
 
 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook V4.4//EN"
-"file:///usr/share/xml/docbook/schema/dtd/4.4/docbookx.dtd"
+"file://@GENTOO_PORTAGE_EPREFIX@/usr/share/sgml/docbook/xml-dtd-4.4/docbookx.dtd"
 []>
 
 <refentry>
--- moreutils/sponge.docbook
+++ moreutils/sponge.docbook
@@ -21,7 +21,7 @@
 -->
 
 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook V4.4//EN"
-"file:///usr/share/xml/docbook/schema/dtd/4.4/docbookx.dtd"
+"file://@GENTOO_PORTAGE_EPREFIX@/usr/share/sgml/docbook/xml-dtd-4.4/docbookx.dtd"
 []>
 
 <refentry>