diff --git a/src/pocketmine/network/mcpe/protocol/InventoryTransactionPacket.php b/src/pocketmine/network/mcpe/protocol/InventoryTransactionPacket.php
index 5d8782ec32..c9ff1429ec 100644
--- a/src/pocketmine/network/mcpe/protocol/InventoryTransactionPacket.php
+++ b/src/pocketmine/network/mcpe/protocol/InventoryTransactionPacket.php
@@ -81,8 +81,11 @@ class InventoryTransactionPacket extends DataPacket{
 	const SOURCE_TYPE_CONTAINER_DROP_CONTENTS = -100;
 
 
-	const SOURCE_MAGIC_SLOT_DROP_ITEM = 0;
-	const SOURCE_MAGIC_SLOT_PICKUP_ITEM = 1;
+	const ACTION_MAGIC_SLOT_DROP_ITEM = 0;
+	const ACTION_MAGIC_SLOT_PICKUP_ITEM = 1;
+
+	const ACTION_MAGIC_SLOT_CREATIVE_DELETE_ITEM = 0;
+	const ACTION_MAGIC_SLOT_CREATIVE_CREATE_ITEM = 1;
 
 	public $actions = [];