diff --git a/src/Exception/InvalidArgumentException.php b/src/Exception/InvalidArgumentException.php
index 7ce5294cb..15b7f9137 100644
--- a/src/Exception/InvalidArgumentException.php
+++ b/src/Exception/InvalidArgumentException.php
@@ -2,4 +2,4 @@
 
 namespace GuzzleHttp\Exception;
 
-class InvalidArgumentException extends \InvalidArgumentException implements GuzzleException {}
\ No newline at end of file
+final class InvalidArgumentException extends \InvalidArgumentException implements GuzzleException {}