diff --git a/src/pocketmine/inventory/BaseInventory.php b/src/pocketmine/inventory/BaseInventory.php
index 12cd43882..dee23dd9c 100644
--- a/src/pocketmine/inventory/BaseInventory.php
+++ b/src/pocketmine/inventory/BaseInventory.php
@@ -385,7 +385,7 @@ abstract class BaseInventory implements Inventory{
 	}
 
 	public function setMaxStackSize($size){
-		$this->setMaxStackSize($size);
+		$this->maxStackSize = (int) $size;
 	}
 
 	public function open(Player $who){