diff --git a/code/web/app/app_achievements/class/AchObjective_class.php b/code/web/app/app_achievements/class/AchObjective_class.php
index f58849742..1d946c8fa 100644
--- a/code/web/app/app_achievements/class/AchObjective_class.php
+++ b/code/web/app/app_achievements/class/AchObjective_class.php
@@ -1,5 +1,5 @@
 <?php
-	class AchObjective {
+	class AchObjective implements Parentum {
 		private $id;
 		private $perk;
 		private $condition;
diff --git a/code/web/app/app_achievements/class/Parentum_inter.php b/code/web/app/app_achievements/class/Parentum_inter.php
new file mode 100644
index 000000000..2a206996d
--- /dev/null
+++ b/code/web/app/app_achievements/class/Parentum_inter.php
@@ -0,0 +1,5 @@
+<?php
+	interface Parentum {
+		function makeChild(&$a);
+	}
+?>
\ No newline at end of file
diff --git a/code/web/app/app_achievements/class/RenderNodeIteraor_abstract.php b/code/web/app/app_achievements/class/RenderNodeIteraor_abstract.php
index 87ac9b460..4b8fd55b1 100644
--- a/code/web/app/app_achievements/class/RenderNodeIteraor_abstract.php
+++ b/code/web/app/app_achievements/class/RenderNodeIteraor_abstract.php
@@ -1,5 +1,5 @@
 <?php
-	abstract class RenderNodeIterator {
+	abstract class RenderNodeIterator implements Parentum {
 		protected $nodes = array();
 
 		function getSize() {
diff --git a/code/web/app/app_achievements/index.php b/code/web/app/app_achievements/index.php
index 7a1d4a9d3..cac79e291 100644
--- a/code/web/app/app_achievements/index.php
+++ b/code/web/app/app_achievements/index.php
@@ -36,6 +36,7 @@ require_once("include/ach_render_common.php");
 require_once("class/RenderNodeIteraor_abstract.php");
 require_once("class/AchList_abstract.php");
 require_once("class/Tieable_inter.php");
+require_once("class/Parentum_inter.php");
 
 require_once("class/AchMenu_class.php");
 require_once("class/AchSummary_class.php");