diff --git a/docs/three-interface.xml b/docs/three-interface.xml
index e8e673ff5..c5c81005e 100644
--- a/docs/three-interface.xml
+++ b/docs/three-interface.xml
@@ -860,7 +860,7 @@ DNAT      loc       dmz:10.10.11.2  tcp    80            -        <emphasis>&lt;
                 <listitem>
                   <para>Include the following in /etc/shorewall/params:</para>
 
-                  <para><command>ETH0_IP=$(find_interface_address
+                  <para><command>ETH0_IP=$(find_first_interface_address
                   eth0)</command></para>
                 </listitem>