diff --git a/src/CharTree.php b/src/CharTree.php
index bc454a1..16fea21 100644
--- a/src/CharTree.php
+++ b/src/CharTree.php
@@ -4,7 +4,6 @@
 
 namespace Stadly\PasswordPolice;
 
-use InvalidArgumentException;
 use IteratorAggregate;
 use Traversable;