diff --git a/src/pocketmine/utils/Binary.php b/src/pocketmine/utils/Binary.php
index 9b3c8c547..cfada9503 100644
--- a/src/pocketmine/utils/Binary.php
+++ b/src/pocketmine/utils/Binary.php
@@ -43,7 +43,7 @@ class Binary{
 		return $value << 48 >> 48;
 	}
 
-	public function unsignShort(int $value) : int{
+	public static function unsignShort(int $value) : int{
 		return $value & 0xffff;
 	}