diff --git a/src/pocketmine/entity/Squid.php b/src/pocketmine/entity/Squid.php
index abce81095..950164fc0 100644
--- a/src/pocketmine/entity/Squid.php
+++ b/src/pocketmine/entity/Squid.php
@@ -40,7 +40,7 @@ class Squid extends WaterAnimal{
 	public $width = 0.95;
 	public $height = 0.95;
 
-	/** @var Vector3 */
+	/** @var Vector3|null */
 	public $swimDirection = null;
 	public $swimSpeed = 0.1;