diff --git a/doc/xsl/isc-manpage.xsl.in b/doc/xsl/isc-manpage.xsl.in
index e540e94252..0be850f053 100644
--- a/doc/xsl/isc-manpage.xsl.in
+++ b/doc/xsl/isc-manpage.xsl.in
@@ -14,7 +14,7 @@
  - PERFORMANCE OF THIS SOFTWARE.
 -->
 
-<!-- $Id: isc-manpage.xsl.in,v 1.4.2.3 2005/09/12 00:07:03 marka Exp $ -->
+<!-- $Id: isc-manpage.xsl.in,v 1.4.2.4 2007/01/26 21:32:35 sra Exp $ -->
 
 <!-- ISC customizations for Docbook-XSL manual page generator. -->
 
@@ -52,6 +52,7 @@
     - disable chunking, and suppress output of .so files.
    -->
   <xsl:template name="write.text.chunk">
+    <xsl:param name="content"/>
     <xsl:if test="substring($content, 1, 4) != '.so ' or
 		  substring-after($content, '&#10;') != ''">
       <xsl:call-template name="isc.no.blanks">