diff --git a/src/pocketmine/network/mcpe/protocol/DataPacket.php b/src/pocketmine/network/mcpe/protocol/DataPacket.php
index 7bbbcba34..c1b983177 100644
--- a/src/pocketmine/network/mcpe/protocol/DataPacket.php
+++ b/src/pocketmine/network/mcpe/protocol/DataPacket.php
@@ -37,9 +37,9 @@ abstract class DataPacket extends NetworkBinaryStream{
 	public $isEncoded = false;
 
 	/** @var int */
-	public $extraByte1 = 0;
+	public $senderSubId = 0;
 	/** @var int */
-	public $extraByte2 = 0;
+	public $recipientSubId = 0;
 
 	public function pid(){
 		return $this::NETWORK_ID;
@@ -75,9 +75,9 @@ abstract class DataPacket extends NetworkBinaryStream{
 		$pid = $this->getUnsignedVarInt();
 		assert($pid === static::NETWORK_ID);
 
-		$this->extraByte1 = $this->getByte();
-		$this->extraByte2 = $this->getByte();
-		assert($this->extraByte1 === 0 and $this->extraByte2 === 0, "Got unexpected non-zero split-screen bytes (byte1: $this->extraByte1, byte2: $this->extraByte2");
+		$this->senderSubId = $this->getByte();
+		$this->recipientSubId = $this->getByte();
+		assert($this->senderSubId === 0 and $this->recipientSubId === 0, "Got unexpected non-zero split-screen bytes (byte1: $this->senderSubId, byte2: $this->recipientSubId");
 	}
 
 	/**
@@ -97,8 +97,8 @@ abstract class DataPacket extends NetworkBinaryStream{
 	protected function encodeHeader(){
 		$this->putUnsignedVarInt(static::NETWORK_ID);
 
-		$this->putByte($this->extraByte1);
-		$this->putByte($this->extraByte2);
+		$this->putByte($this->senderSubId);
+		$this->putByte($this->recipientSubId);
 	}
 
 	/**