diff --git a/src/pocketmine/entity/Entity.php b/src/pocketmine/entity/Entity.php
index 650e133e1..813f8ee34 100644
--- a/src/pocketmine/entity/Entity.php
+++ b/src/pocketmine/entity/Entity.php
@@ -396,7 +396,7 @@ abstract class Entity extends Location implements Metadatable{
 	}
 
 	public function setImmobile($value = true){
-		return $this->setDataFlag(self::DATA_FLAGS, self::DATA_FLAG_IMMOBILE, $value);
+		$this->setDataFlag(self::DATA_FLAGS, self::DATA_FLAG_IMMOBILE, $value);
 	}
 
 	/**