diff --git a/src/pocketmine/Thread.php b/src/pocketmine/Thread.php
index 40ff50985..2a838154f 100644
--- a/src/pocketmine/Thread.php
+++ b/src/pocketmine/Thread.php
@@ -52,10 +52,6 @@ abstract class Thread extends \Thread{
 	 */
 	public function registerClassLoader(){
 		require(\pocketmine\PATH . "vendor/autoload.php");
-		if(!interface_exists("ClassLoader", false)){
-			require(\pocketmine\PATH . "src/spl/ClassLoader.php");
-			require(\pocketmine\PATH . "src/spl/BaseClassLoader.php");
-		}
 		if($this->classLoader !== null){
 			$this->classLoader->register(false);
 		}
diff --git a/src/pocketmine/Worker.php b/src/pocketmine/Worker.php
index 81365d271..f63f4b2ed 100644
--- a/src/pocketmine/Worker.php
+++ b/src/pocketmine/Worker.php
@@ -53,10 +53,6 @@ abstract class Worker extends \Worker{
 	 */
 	public function registerClassLoader(){
 		require(\pocketmine\PATH . "vendor/autoload.php");
-		if(!interface_exists("ClassLoader", false)){
-			require(\pocketmine\PATH . "src/spl/ClassLoader.php");
-			require(\pocketmine\PATH . "src/spl/BaseClassLoader.php");
-		}
 		if($this->classLoader !== null){
 			$this->classLoader->register(false);
 		}