diff --git a/src/pocketmine/metadata/PlayerMetadataStore.php b/src/pocketmine/metadata/PlayerMetadataStore.php
index f02c2dcfe..5194c6a68 100644
--- a/src/pocketmine/metadata/PlayerMetadataStore.php
+++ b/src/pocketmine/metadata/PlayerMetadataStore.php
@@ -21,15 +21,15 @@
 
 namespace pocketmine\metadata;
 
-use pocketmine\OfflinePlayer;
+use pocketmine\IPlayer;
 
 class PlayerMetadataStore extends MetadataStore{
 
 	public function disambiguate(Metadatable $player, $metadataKey){
-		if(!($player instanceof OfflinePlayer)){
-			throw new \InvalidArgumentException("Argument must be an OfflinePlayer instance");
+		if(!($player instanceof IPlayer)){
+			throw new \InvalidArgumentException("Argument must be an IPlayer instance");
 		}
 
 		return strtolower($player->getName()) . ":" . $metadataKey;
 	}
-}
\ No newline at end of file
+}