diff --git a/src/pocketmine/level/format/mcregion/RegionLoader.php b/src/pocketmine/level/format/mcregion/RegionLoader.php
index e13ce8067..10a6eb008 100644
--- a/src/pocketmine/level/format/mcregion/RegionLoader.php
+++ b/src/pocketmine/level/format/mcregion/RegionLoader.php
@@ -131,7 +131,7 @@ class RegionLoader{
 		}
 
 		$chunk = $this->unserializeChunk(fread($this->filePointer, $length - 1));
-		if($chunk instanceof Chunk){
+		if($chunk instanceof FullChunk){
 			return $chunk;
 		}elseif($forward === false){
 			MainLogger::getLogger()->error("Corrupted chunk detected");