diff --git a/lib/PHPCfg/ParserHandler/Batch/Unary.php b/lib/PHPCfg/ParserHandler/Batch/Unary.php
index 921c09e..58b41fe 100644
--- a/lib/PHPCfg/ParserHandler/Batch/Unary.php
+++ b/lib/PHPCfg/ParserHandler/Batch/Unary.php
@@ -9,6 +9,7 @@
 
 namespace PHPCfg\ParserHandler\Batch;
 
+use PHPCfg\Assertion;
 use PHPCfg\Op;
 use PHPCfg\Operand;
 use PHPCfg\ParserHandler;