diff --git a/en_US.ISO8859-1/books/porters-handbook/book.sgml b/en_US.ISO8859-1/books/porters-handbook/book.sgml
index 5cadcc9a24..7e48bc620d 100644
--- a/en_US.ISO8859-1/books/porters-handbook/book.sgml
+++ b/en_US.ISO8859-1/books/porters-handbook/book.sgml
@@ -6080,7 +6080,9 @@ Reference: <http://www.freebsd.org/ports/portaudit/74a9541d-5d6c-11d8-80e3-00
 
 	<para>The preferred way to tell 4.3BSD/Reno (1990) and newer versions
 	  of the BSD code apart is by using the <literal>BSD</literal> macro
-	  defined in <filename>&lt;sys/param.h&gt;</filename>.  Hopefully that
+	  defined in
+	  <ulink url="http://cvsweb.freebsd.org/src/sys/sys/param.h">sys/param.h</ulink>.
+	  Hopefully that
 	  file is already included; if not, add the code:</para>
 
 	<programlisting>#if (defined(__unix__) || defined(unix)) &amp;&amp; !defined(USG)
@@ -6178,7 +6180,7 @@ Reference: &lt;http://www.freebsd.org/ports/portaudit/74a9541d-5d6c-11d8-80e3-00
 
 	  <para>Here is a convenient list of
 	    <literal>__FreeBSD_version</literal> values as defined in
-	    <filename>sys/param.h</filename>:</para>
+	    <ulink url="http://cvsweb.freebsd.org/src/sys/sys/param.h">sys/param.h</ulink>:</para>
 
 		<table frame="none">
 		  <title>__FreeBSD_version values</title>