diff --git a/chapter06/flex.xml b/chapter06/flex.xml
index b856e67d9..7ed596a94 100644
--- a/chapter06/flex.xml
+++ b/chapter06/flex.xml
@@ -74,7 +74,7 @@
     runs <filename>flex</filename> in <command>lex</command> emulation
     mode:</para>
 
-<screen><userinput remap="install">ln -s flex /usr/bin/lex</userinput></screen>
+<screen><userinput remap="install">ln -sv flex /usr/bin/lex</userinput></screen>
 
   </sect2>