diff --git a/src/pocketmine/Thread.php b/src/pocketmine/Thread.php
index 86d923316..5a174c2dc 100644
--- a/src/pocketmine/Thread.php
+++ b/src/pocketmine/Thread.php
@@ -76,11 +76,9 @@ abstract class Thread extends \Thread{
 	}
 
 	/**
-	 * @param int|null $options TODO: pthreads bug
-	 *
 	 * @return bool
 	 */
-	public function start(?int $options = PTHREADS_INHERIT_ALL){
+	public function start(int $options = PTHREADS_INHERIT_ALL){
 		ThreadManager::getInstance()->add($this);
 
 		if($this->getClassLoader() === null){
diff --git a/src/pocketmine/Worker.php b/src/pocketmine/Worker.php
index 3687e80b4..ea8d4c871 100644
--- a/src/pocketmine/Worker.php
+++ b/src/pocketmine/Worker.php
@@ -76,11 +76,9 @@ abstract class Worker extends \Worker{
 	}
 
 	/**
-	 * @param int|null $options TODO: pthreads bug
-	 *
 	 * @return bool
 	 */
-	public function start(?int $options = PTHREADS_INHERIT_ALL){
+	public function start(int $options = PTHREADS_INHERIT_ALL){
 		ThreadManager::getInstance()->add($this);
 
 		if($this->getClassLoader() === null){