diff --git a/src/pocketmine/Player.php b/src/pocketmine/Player.php
index 73f0a687d..b8c5ee62b 100644
--- a/src/pocketmine/Player.php
+++ b/src/pocketmine/Player.php
@@ -262,7 +262,7 @@ class Player extends Human implements CommandSender, InventoryHolder, ChunkLoade
 	}
 
 	public function isBanned(){
-		return $this->server->getNameBans()->isBanned(strtolower($this->getName()));
+		return $this->server->getNameBans()->isBanned($this->iusername);
 	}
 
 	public function setBanned($value){
@@ -275,14 +275,14 @@ class Player extends Human implements CommandSender, InventoryHolder, ChunkLoade
 	}
 
 	public function isWhitelisted(){
-		return $this->server->isWhitelisted(strtolower($this->getName()));
+		return $this->server->isWhitelisted($this->iusername);
 	}
 
 	public function setWhitelisted($value){
 		if($value === true){
-			$this->server->addWhitelist(strtolower($this->getName()));
+			$this->server->addWhitelist($this->iusername);
 		}else{
-			$this->server->removeWhitelist(strtolower($this->getName()));
+			$this->server->removeWhitelist($this->iusername);
 		}
 	}
 
@@ -1667,11 +1667,11 @@ class Player extends Human implements CommandSender, InventoryHolder, ChunkLoade
 	}
 
 	protected function processLogin(){
-		if(!$this->server->isWhitelisted(strtolower($this->getName()))){
+		if(!$this->server->isWhitelisted($this->iusername)){
 			$this->close($this->getLeaveMessage(), "Server is white-listed");
 
 			return;
-		}elseif($this->server->getNameBans()->isBanned(strtolower($this->getName())) or $this->server->getIPBans()->isBanned($this->getAddress())){
+		}elseif($this->server->getNameBans()->isBanned($this->iusername) or $this->server->getIPBans()->isBanned($this->getAddress())){
 			$this->close($this->getLeaveMessage(), "You are banned");
 
 			return;
@@ -1685,7 +1685,7 @@ class Player extends Human implements CommandSender, InventoryHolder, ChunkLoade
 		}
 
 		foreach($this->server->getOnlinePlayers() as $p){
-			if($p !== $this and strtolower($p->getName()) === strtolower($this->getName())){
+			if($p !== $this and $p->iusername === $this->iusername){
 				if($p->kick("logged in from another location") === false){
 					$this->close($this->getLeaveMessage(), "Logged in from another location");
 					return;