diff --git a/chapter06/man.xml b/chapter06/man.xml
index 96fd3c77e..05856c34c 100644
--- a/chapter06/man.xml
+++ b/chapter06/man.xml
@@ -31,7 +31,7 @@ properly handled by Less:</para>
 /usr/man" line in the <filename>man.conf</filename> file to prevent redundant
 results when using programs such as <userinput>whatis</userinput>:</para>
 
-<screen><userinput>sed -i 's%MANPATH./usr/man%#&%' src/man.conf.in</userinput></screen>
+<screen><userinput>sed -i 's%MANPATH./usr/man%#&amp;%' src/man.conf.in</userinput></screen>
  
 <para>Now prepare Man for compilation:</para>