diff --git a/src/pocketmine/level/format/io/region/Anvil.php b/src/pocketmine/level/format/io/region/Anvil.php
index 9b48a2830..084126b5f 100644
--- a/src/pocketmine/level/format/io/region/Anvil.php
+++ b/src/pocketmine/level/format/io/region/Anvil.php
@@ -101,7 +101,7 @@ class Anvil extends McRegion{
 	public function nbtDeserialize(string $data){
 		$nbt = new NBT(NBT::BIG_ENDIAN);
 		try{
-			$nbt->readCompressed($data, ZLIB_ENCODING_DEFLATE);
+			$nbt->readCompressed($data);
 
 			$chunk = $nbt->getData();
 
diff --git a/src/pocketmine/level/format/io/region/McRegion.php b/src/pocketmine/level/format/io/region/McRegion.php
index 07563c8ab..bf342a705 100644
--- a/src/pocketmine/level/format/io/region/McRegion.php
+++ b/src/pocketmine/level/format/io/region/McRegion.php
@@ -126,7 +126,7 @@ class McRegion extends BaseLevelProvider{
 	public function nbtDeserialize(string $data){
 		$nbt = new NBT(NBT::BIG_ENDIAN);
 		try{
-			$nbt->readCompressed($data, ZLIB_ENCODING_DEFLATE);
+			$nbt->readCompressed($data);
 
 			$chunk = $nbt->getData();
 
diff --git a/src/pocketmine/level/format/io/region/PMAnvil.php b/src/pocketmine/level/format/io/region/PMAnvil.php
index cb28cb17f..9ec30c203 100644
--- a/src/pocketmine/level/format/io/region/PMAnvil.php
+++ b/src/pocketmine/level/format/io/region/PMAnvil.php
@@ -104,7 +104,7 @@ class PMAnvil extends Anvil{
 	public function nbtDeserialize(string $data){
 		$nbt = new NBT(NBT::BIG_ENDIAN);
 		try{
-			$nbt->readCompressed($data, ZLIB_ENCODING_DEFLATE);
+			$nbt->readCompressed($data);
 
 			$chunk = $nbt->getData();
 
diff --git a/src/pocketmine/nbt/NBT.php b/src/pocketmine/nbt/NBT.php
index 5fa2fdd3f..f929f58e3 100644
--- a/src/pocketmine/nbt/NBT.php
+++ b/src/pocketmine/nbt/NBT.php
@@ -423,11 +423,11 @@ class NBT{
 		$this->buffer = "";
 	}
 
-	public function readCompressed($buffer, $compression = ZLIB_ENCODING_GZIP){
+	public function readCompressed($buffer){
 		$this->read(zlib_decode($buffer));
 	}
 
-	public function readNetworkCompressed($buffer, $compression = ZLIB_ENCODING_GZIP){
+	public function readNetworkCompressed($buffer){
 		$this->read(zlib_decode($buffer), false, true);
 	}