diff --git a/webapp/mt/Item.php b/webapp/mt/Item.php
index 85a48bc5..009c53e0 100644
--- a/webapp/mt/Item.php
+++ b/webapp/mt/Item.php
@@ -103,6 +103,7 @@ class Item {
     const CRYSTAL_TYPE = 26;
 
     const CHEST_BOX_TYPE = 23;
+    const PLANET_TYPE = 28;
 
     const FUNC_RENAME_CARD_SUBTYPE = 1;
     const MATERIAL_CHIP_SUBTYPE = 3;