diff --git a/src/pocketmine/block/Stair.php b/src/pocketmine/block/Stair.php
index 8da691a0d..7123d787f 100644
--- a/src/pocketmine/block/Stair.php
+++ b/src/pocketmine/block/Stair.php
@@ -22,6 +22,7 @@
 namespace pocketmine\block;
 
 use pocketmine\item\Item;
+use pocketmine\math\AxisAlignedBB;
 use pocketmine\Player;
 
 class Stair extends Transparent{
@@ -36,6 +37,28 @@ class Stair extends Transparent{
 		$this->hardness = 30;
 	}
 
+	public function getBoundingBox(){
+		if(($this->getDamage() & 0x04) > 0){
+			return new AxisAlignedBB(
+				$this->x,
+				$this->y + 0.5,
+				$this->z,
+				$this->x + 1,
+				$this->y + 1,
+				$this->z + 1
+			);
+		}else{
+			return new AxisAlignedBB(
+				$this->x,
+				$this->y,
+				$this->z,
+				$this->x + 1,
+				$this->y + 0.5,
+				$this->z + 1
+			);
+		}
+	}
+
 	public function place(Item $item, Block $block, Block $target, $face, $fx, $fy, $fz, Player $player = null){
 		$faces = [
 			0 => 0,