diff --git a/INSTALL b/INSTALL
index 689c3e9a4..df1dcb341 100644
--- a/INSTALL
+++ b/INSTALL
@@ -246,7 +246,7 @@ First, define the following map files on your server (it should work with
   password = <password>
   dbname = <database>
   hosts = 127.0.0.1
-  query = SELECT concat(t3.name, '/', t2.path) FROM admin_domainalias AS t1, admin_mailbox AS t2, admin_domain AS t3 WHERE t1.target_id=t2.domain_id AND t2.domain_id=t3.id AND t1.name='%d' AND t2.address='%u'
+  query = SELECT concat(t2.address, '@', t3.name) FROM admin_domainalias AS t1, admin_mailbox AS t2, admin_domain AS t3 WHERE t1.target_id=t2.domain_id AND t2.domain_id=t3.id AND t1.name='%d' AND t2.address='%u'
 
 Then, use the following configuration in the */etc/postfix/main.cf* file
 (this is just one possible configuration)::