diff --git a/chapter09/symlinks.xml b/chapter09/symlinks.xml
index 71e35f231..dd79b9ffd 100644
--- a/chapter09/symlinks.xml
+++ b/chapter09/symlinks.xml
@@ -123,7 +123,7 @@
       <filename>/usr/lib/udev/network/99-default.link</filename>:</para>
 
 <screen role="nodump"><userinput>sed -e '/^AlternativeNamesPolicy/s/=.*$/=/'  \
-    -i /usr/lib/udev/network/99-default.link \
+       /usr/lib/udev/network/99-default.link \
      > /etc/udev/network/99-default.link</userinput></screen>
     </sect3>