diff --git a/src/pocketmine/network/rcon/RCONInstance.php b/src/pocketmine/network/rcon/RCONInstance.php
index 079eae6c8..670b70df4 100644
--- a/src/pocketmine/network/rcon/RCONInstance.php
+++ b/src/pocketmine/network/rcon/RCONInstance.php
@@ -27,6 +27,10 @@ use pocketmine\Thread;
 use pocketmine\utils\Binary;
 
 class RCONInstance extends Thread{
+	private const STATUS_DISCONNECTED = -1;
+	private const STATUS_AUTHENTICATING = 0;
+	private const STATUS_CONNECTED = 1;
+
 	public $stop;
 	public $cmd;
 	public $response;
@@ -54,7 +58,7 @@ class RCONInstance extends Thread{
 		$this->maxClients = $maxClients;
 		for($n = 0; $n < $this->maxClients; ++$n){
 			$this->{"client" . $n} = null;
-			$this->{"status" . $n} = 0;
+			$this->{"status" . $n} = self::STATUS_DISCONNECTED;
 			$this->{"timeout" . $n} = 0;
 		}
 
@@ -111,7 +115,7 @@ class RCONInstance extends Thread{
 					for($n = 0; $n < $this->maxClients; ++$n){
 						if($this->{"client" . $n} === null){
 							$this->{"client" . $n} = $client;
-							$this->{"status" . $n} = 0;
+							$this->{"status" . $n} = self::STATUS_AUTHENTICATING;
 							$this->{"timeout" . $n} = microtime(true) + 5;
 							$done = true;
 							break;
@@ -126,14 +130,14 @@ class RCONInstance extends Thread{
 			for($n = 0; $n < $this->maxClients; ++$n){
 				$client = &$this->{"client" . $n};
 				if($client !== null){
-					if($this->{"status" . $n} !== -1 and !$this->stop){
-						if($this->{"status" . $n} === 0 and $this->{"timeout" . $n} < microtime(true)){ //Timeout
-							$this->{"status" . $n} = -1;
+					if($this->{"status" . $n} !== self::STATUS_DISCONNECTED and !$this->stop){
+						if($this->{"status" . $n} === self::STATUS_AUTHENTICATING and $this->{"timeout" . $n} < microtime(true)){ //Timeout
+							$this->{"status" . $n} = self::STATUS_DISCONNECTED;
 							continue;
 						}
 						$p = $this->readPacket($client, $size, $requestID, $packetType, $payload);
 						if($p === false){
-							$this->{"status" . $n} = -1;
+							$this->{"status" . $n} = self::STATUS_DISCONNECTED;
 							continue;
 						}elseif($p === null){
 							continue;
@@ -141,8 +145,8 @@ class RCONInstance extends Thread{
 
 						switch($packetType){
 							case 3: //Login
-								if($this->{"status" . $n} !== 0){
-									$this->{"status" . $n} = -1;
+								if($this->{"status" . $n} !== self::STATUS_AUTHENTICATING){
+									$this->{"status" . $n} = self::STATUS_DISCONNECTED;
 									continue;
 								}
 								if($payload === $this->password){
@@ -155,16 +159,16 @@ class RCONInstance extends Thread{
 									$this->waiting = false;
 									$this->response = "";
 									$this->writePacket($client, $requestID, 2, "");
-									$this->{"status" . $n} = 1;
+									$this->{"status" . $n} = self::STATUS_CONNECTED;
 								}else{
-									$this->{"status" . $n} = -1;
+									$this->{"status" . $n} = self::STATUS_DISCONNECTED;
 									$this->writePacket($client, -1, 2, "");
 									continue;
 								}
 								break;
 							case 2: //Command
-								if($this->{"status" . $n} !== 1){
-									$this->{"status" . $n} = -1;
+								if($this->{"status" . $n} !== self::STATUS_CONNECTED){
+									$this->{"status" . $n} = self::STATUS_DISCONNECTED;
 									continue;
 								}
 								if(strlen($payload) > 0){
@@ -187,7 +191,7 @@ class RCONInstance extends Thread{
 						@socket_set_block($client);
 						@socket_read($client, 1);
 						@socket_close($client);
-						$this->{"status" . $n} = 0;
+						$this->{"status" . $n} = self::STATUS_DISCONNECTED;
 						$this->{"client" . $n} = null;
 					}
 				}