diff --git a/src/block/Barrel.php b/src/block/Barrel.php
index 344f7a43a..2c939c43a 100644
--- a/src/block/Barrel.php
+++ b/src/block/Barrel.php
@@ -31,6 +31,7 @@ use pocketmine\math\Facing;
 use pocketmine\math\Vector3;
 use pocketmine\player\Player;
 use pocketmine\world\BlockTransaction;
+use function abs;
 
 class Barrel extends Opaque{
 	use AnyFacingTrait;