diff --git a/src/pocketmine/Server.php b/src/pocketmine/Server.php
index 3b120c388..5fec9f9bf 100644
--- a/src/pocketmine/Server.php
+++ b/src/pocketmine/Server.php
@@ -1439,6 +1439,18 @@ class Server{
 			}
 			$this->config = new Config($this->dataPath . "pocketmine.yml", Config::YAML, []);
 
+			define('pocketmine\DEBUG', (int) $this->getProperty("debug.level", 1));
+
+			if(((int) ini_get('zend.assertions')) > 0 and ((bool) $this->getProperty("debug.assertions.warn-if-enabled", true)) !== false){
+				$this->logger->warning("Debugging assertions are enabled, this may impact on performance. To disable them, set `zend.assertions = -1` in php.ini.");
+			}
+
+			ini_set('assert.exception', '1');
+
+			if($this->logger instanceof MainLogger){
+				$this->logger->setLogDebug(\pocketmine\DEBUG > 1);
+			}
+
 			$this->logger->info("Loading server properties...");
 			$this->properties = new Config($this->dataPath . "server.properties", Config::PROPERTIES, [
 				"motd" => "Minecraft: PE Server",
@@ -1540,18 +1552,6 @@ class Server{
 				$this->setConfigInt("difficulty", 3);
 			}
 
-			define('pocketmine\DEBUG', (int) $this->getProperty("debug.level", 1));
-
-			if(((int) ini_get('zend.assertions')) > 0 and ((bool) $this->getProperty("debug.assertions.warn-if-enabled", true)) !== false){
-				$this->logger->warning("Debugging assertions are enabled, this may impact on performance. To disable them, set `zend.assertions = -1` in php.ini.");
-			}
-
-			ini_set('assert.exception', '1');
-
-			if($this->logger instanceof MainLogger){
-				$this->logger->setLogDebug(\pocketmine\DEBUG > 1);
-			}
-
 			if(\pocketmine\DEBUG >= 0){
 				@cli_set_process_title($this->getName() . " " . $this->getPocketMineVersion());
 			}
diff --git a/src/pocketmine/resources/pocketmine.yml b/src/pocketmine/resources/pocketmine.yml
index d8bc7d88c..6c81de581 100644
--- a/src/pocketmine/resources/pocketmine.yml
+++ b/src/pocketmine/resources/pocketmine.yml
@@ -37,6 +37,11 @@ memory:
  #This will stop the server when the limit is surpassed
  main-hard-limit: 1024
 
+ #AsyncWorker threads' hard memory limit in megabytes. Set to 0 to disable
+ #This will stop the server if any worker exceeds this limit.
+ #NOTE: THIS LIMIT APPLIES PER WORKER, NOT TO THE WHOLE PROCESS.
+ async-worker-hard-limit: 1024
+
  #Period in ticks to check memory (default 1 second)
  check-rate: 20
 
diff --git a/src/pocketmine/scheduler/AsyncPool.php b/src/pocketmine/scheduler/AsyncPool.php
index 6d13e3d6d..9a7e6ed65 100644
--- a/src/pocketmine/scheduler/AsyncPool.php
+++ b/src/pocketmine/scheduler/AsyncPool.php
@@ -47,9 +47,11 @@ class AsyncPool{
 		$this->server = $server;
 		$this->size = $size;
 
+		$memoryLimit =  (int) max(-1, (int) $this->server->getProperty("memory.async-worker-hard-limit", 1024));
+
 		for($i = 0; $i < $this->size; ++$i){
 			$this->workerUsage[$i] = 0;
-			$this->workers[$i] = new AsyncWorker($this->server->getLogger(), $i + 1);
+			$this->workers[$i] = new AsyncWorker($this->server->getLogger(), $i + 1, $memoryLimit);
 			$this->workers[$i]->setClassLoader($this->server->getLoader());
 			$this->workers[$i]->start();
 		}
@@ -61,9 +63,12 @@ class AsyncPool{
 
 	public function increaseSize(int $newSize){
 		if($newSize > $this->size){
+
+			$memoryLimit = (int) max(-1, (int) $this->server->getProperty("memory.async-worker-hard-limit", 1024));
+
 			for($i = $this->size; $i < $newSize; ++$i){
 				$this->workerUsage[$i] = 0;
-				$this->workers[$i] = new AsyncWorker($this->server->getLogger(), $i + 1);
+				$this->workers[$i] = new AsyncWorker($this->server->getLogger(), $i + 1, $memoryLimit);
 				$this->workers[$i]->setClassLoader($this->server->getLoader());
 				$this->workers[$i]->start();
 			}
diff --git a/src/pocketmine/scheduler/AsyncWorker.php b/src/pocketmine/scheduler/AsyncWorker.php
index 7b8532feb..80608acda 100644
--- a/src/pocketmine/scheduler/AsyncWorker.php
+++ b/src/pocketmine/scheduler/AsyncWorker.php
@@ -31,17 +31,27 @@ class AsyncWorker extends Worker{
 	private $logger;
 	private $id;
 
-	public function __construct(MainLogger $logger, int $id){
+	/** @var int */
+	private $memoryLimit;
+
+	public function __construct(MainLogger $logger, int $id, int $memoryLimit){
 		$this->logger = $logger;
 		$this->id = $id;
+		$this->memoryLimit = $memoryLimit;
 	}
 
 	public function run(){
 		$this->registerClassLoader();
 		$this->logger->registerStatic();
-
 		gc_enable();
-		ini_set("memory_limit", '-1');
+
+		if($this->memoryLimit > 0){
+			ini_set('memory_limit', $this->memoryLimit . 'M');
+			$this->logger->debug("Set memory limit to " . $this->memoryLimit . " MB");
+		}else{
+			ini_set('memory_limit', '-1');
+			$this->logger->debug("No memory limit set");
+		}
 
 		global $store;
 		$store = [];