diff --git a/src/block/tile/ChiseledBookshelf.php b/src/block/tile/ChiseledBookshelf.php
index f9d61e7eb..6455208fe 100644
--- a/src/block/tile/ChiseledBookshelf.php
+++ b/src/block/tile/ChiseledBookshelf.php
@@ -59,7 +59,7 @@ class ChiseledBookshelf extends Tile implements Container{
 		$this->loadItems($nbt);
 	}
 
-	public function writeSaveData(CompoundTag $nbt) : void{
+	protected function writeSaveData(CompoundTag $nbt) : void{
 		$this->saveItems($nbt);
 	}