diff --git a/src/pocketmine/tile/ContainerTrait.php b/src/pocketmine/tile/ContainerTrait.php
index cf9558195..e6df4951d 100644
--- a/src/pocketmine/tile/ContainerTrait.php
+++ b/src/pocketmine/tile/ContainerTrait.php
@@ -47,6 +47,7 @@ trait ContainerTrait{
 			$inventoryTag = $this->getNBT()->getListTag(Container::TAG_ITEMS);
 
 			$inventory = $this->getRealInventory();
+			/** @var CompoundTag $itemNBT */
 			foreach($inventoryTag as $itemNBT){
 				$inventory->setItem($itemNBT->getByte("Slot"), Item::nbtDeserialize($itemNBT));
 			}