diff --git a/src/pocketmine/tile/Banner.php b/src/pocketmine/tile/Banner.php
index 9cdf3a30c..e538f5819 100644
--- a/src/pocketmine/tile/Banner.php
+++ b/src/pocketmine/tile/Banner.php
@@ -118,7 +118,7 @@ class Banner extends Spawnable implements Nameable{
 		$this->saveName($nbt);
 	}
 
-	public function addAdditionalSpawnData(CompoundTag $nbt) : void{
+	protected function addAdditionalSpawnData(CompoundTag $nbt) : void{
 		$nbt->setInt(self::TAG_BASE, $this->baseColor);
 		$nbt->setTag($this->patterns);
 		$this->addNameSpawnData($nbt);
diff --git a/src/pocketmine/tile/Bed.php b/src/pocketmine/tile/Bed.php
index 322e42d62..b53c3de27 100644
--- a/src/pocketmine/tile/Bed.php
+++ b/src/pocketmine/tile/Bed.php
@@ -51,7 +51,7 @@ class Bed extends Spawnable{
 		$nbt->setByte(self::TAG_COLOR, $this->color);
 	}
 
-	public function addAdditionalSpawnData(CompoundTag $nbt) : void{
+	protected function addAdditionalSpawnData(CompoundTag $nbt) : void{
 		$nbt->setByte(self::TAG_COLOR, $this->color);
 	}
 
diff --git a/src/pocketmine/tile/Chest.php b/src/pocketmine/tile/Chest.php
index f8d202114..15ff38580 100644
--- a/src/pocketmine/tile/Chest.php
+++ b/src/pocketmine/tile/Chest.php
@@ -192,7 +192,7 @@ class Chest extends Spawnable implements InventoryHolder, Container, Nameable{
 		return true;
 	}
 
-	public function addAdditionalSpawnData(CompoundTag $nbt) : void{
+	protected function addAdditionalSpawnData(CompoundTag $nbt) : void{
 		if($this->isPaired()){
 			$nbt->setInt(self::TAG_PAIRX, $this->pairX);
 			$nbt->setInt(self::TAG_PAIRZ, $this->pairZ);
diff --git a/src/pocketmine/tile/EnderChest.php b/src/pocketmine/tile/EnderChest.php
index 822c4c01a..c3b868117 100644
--- a/src/pocketmine/tile/EnderChest.php
+++ b/src/pocketmine/tile/EnderChest.php
@@ -35,7 +35,7 @@ class EnderChest extends Spawnable{
 
 	}
 
-	public function addAdditionalSpawnData(CompoundTag $nbt) : void{
+	protected function addAdditionalSpawnData(CompoundTag $nbt) : void{
 
 	}
 
diff --git a/src/pocketmine/tile/FlowerPot.php b/src/pocketmine/tile/FlowerPot.php
index 84de9f06c..7b69d69af 100644
--- a/src/pocketmine/tile/FlowerPot.php
+++ b/src/pocketmine/tile/FlowerPot.php
@@ -83,7 +83,7 @@ class FlowerPot extends Spawnable{
 		return $this->getItem()->isNull();
 	}
 
-	public function addAdditionalSpawnData(CompoundTag $nbt) : void{
+	protected function addAdditionalSpawnData(CompoundTag $nbt) : void{
 		$nbt->setShort(self::TAG_ITEM, $this->item->getId());
 		$nbt->setInt(self::TAG_ITEM_DATA, $this->item->getDamage());
 	}
diff --git a/src/pocketmine/tile/Furnace.php b/src/pocketmine/tile/Furnace.php
index a952d0daf..6a78db168 100644
--- a/src/pocketmine/tile/Furnace.php
+++ b/src/pocketmine/tile/Furnace.php
@@ -230,7 +230,7 @@ class Furnace extends Spawnable implements InventoryHolder, Container, Nameable{
 		return $ret;
 	}
 
-	public function addAdditionalSpawnData(CompoundTag $nbt) : void{
+	protected function addAdditionalSpawnData(CompoundTag $nbt) : void{
 		$nbt->setShort(self::TAG_BURN_TIME, $this->burnTime);
 		$nbt->setShort(self::TAG_COOK_TIME, $this->cookTime);
 
diff --git a/src/pocketmine/tile/ItemFrame.php b/src/pocketmine/tile/ItemFrame.php
index 56ab6b7f2..4b573395f 100644
--- a/src/pocketmine/tile/ItemFrame.php
+++ b/src/pocketmine/tile/ItemFrame.php
@@ -90,7 +90,7 @@ class ItemFrame extends Spawnable{
 		$this->onChanged();
 	}
 
-	public function addAdditionalSpawnData(CompoundTag $nbt) : void{
+	protected function addAdditionalSpawnData(CompoundTag $nbt) : void{
 		$nbt->setFloat(self::TAG_ITEM_DROP_CHANCE, $this->itemDropChance);
 		$nbt->setByte(self::TAG_ITEM_ROTATION, $this->itemRotation);
 		$nbt->setTag($this->item->nbtSerialize(-1, self::TAG_ITEM));
diff --git a/src/pocketmine/tile/Sign.php b/src/pocketmine/tile/Sign.php
index 6e1f6e45e..bf28e8942 100644
--- a/src/pocketmine/tile/Sign.php
+++ b/src/pocketmine/tile/Sign.php
@@ -120,7 +120,7 @@ class Sign extends Spawnable{
 		return $this->text;
 	}
 
-	public function addAdditionalSpawnData(CompoundTag $nbt) : void{
+	protected function addAdditionalSpawnData(CompoundTag $nbt) : void{
 		$nbt->setString(self::TAG_TEXT_BLOB, implode("\n", $this->text));
 	}
 
diff --git a/src/pocketmine/tile/Skull.php b/src/pocketmine/tile/Skull.php
index 828c67d1a..4367991a6 100644
--- a/src/pocketmine/tile/Skull.php
+++ b/src/pocketmine/tile/Skull.php
@@ -65,7 +65,7 @@ class Skull extends Spawnable{
 		return $this->skullType;
 	}
 
-	public function addAdditionalSpawnData(CompoundTag $nbt) : void{
+	protected function addAdditionalSpawnData(CompoundTag $nbt) : void{
 		$nbt->setByte(self::TAG_SKULL_TYPE, $this->skullType);
 		$nbt->setByte(self::TAG_ROT, $this->skullRotation);
 	}
diff --git a/src/pocketmine/tile/Spawnable.php b/src/pocketmine/tile/Spawnable.php
index 1937c7d00..76c3f3c64 100644
--- a/src/pocketmine/tile/Spawnable.php
+++ b/src/pocketmine/tile/Spawnable.php
@@ -120,7 +120,7 @@ abstract class Spawnable extends Tile{
 	 *
 	 * @param CompoundTag $nbt
 	 */
-	abstract public function addAdditionalSpawnData(CompoundTag $nbt) : void;
+	abstract protected function addAdditionalSpawnData(CompoundTag $nbt) : void;
 
 	/**
 	 * Called when a player updates a block entity's NBT data