diff --git a/postlfs/security/linux-pam.xml b/postlfs/security/linux-pam.xml
index b21ce3b540..631fa4122b 100644
--- a/postlfs/security/linux-pam.xml
+++ b/postlfs/security/linux-pam.xml
@@ -164,7 +164,7 @@ make</userinput></screen>
          overwrites the configuration files in
          <filename class="directory">/etc/security</filename> as well as
          <filename>/etc/environment</filename>. In case you
-         have modified those files, be sure to backup them.
+         have modified those files, be sure to back them up.
       </para>
     </caution>