diff --git a/src/pocketmine/entity/Slime.php b/src/pocketmine/entity/Slime.php
index 66f78d473..e402d02bb 100644
--- a/src/pocketmine/entity/Slime.php
+++ b/src/pocketmine/entity/Slime.php
@@ -24,4 +24,5 @@ namespace pocketmine\entity;
 
 class Slime extends Living{
 
+	const DATA_SIZE = 16;
 }
\ No newline at end of file