diff --git a/install/lib/installer_base.lib.php b/install/lib/installer_base.lib.php
index 7dd49b1389954d26030c2539eab55c71a86b6dc2..97e2fcecaa71f0d38f19d6f4c75d54043d0114e1 100644
--- a/install/lib/installer_base.lib.php
+++ b/install/lib/installer_base.lib.php
@@ -999,7 +999,7 @@ class installer_base {
 		chgrp($config_dir.'/'.$configfile, 'root');
 		
 		// Dovecot shall ignore mounts in website directory
-		exec("doveadm mount add '/var/www/*' ignore > /dev/null 2> /dev/null");
+		if(is_installed('doveadm')) exec("doveadm mount add '/var/www/*' ignore > /dev/null 2> /dev/null");
 
 	}