diff --git a/src/pocketmine/block/Stair.php b/src/pocketmine/block/Stair.php
index 7416b6fd6..8e5b30f8a 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\item\Tool;
 use pocketmine\math\AxisAlignedBB;
 use pocketmine\Player;
 
@@ -151,4 +152,4 @@ abstract class Stair extends Transparent{
 			return [];
 		}
 	}
-}
\ No newline at end of file
+}