diff --git a/src/Languages/Php/Patterns/PhpAsymmetricPropertyPattern.php b/src/Languages/Php/Patterns/PhpAsymmetricPropertyPattern.php
index 3ebfcb9..dd28812 100644
--- a/src/Languages/Php/Patterns/PhpAsymmetricPropertyPattern.php
+++ b/src/Languages/Php/Patterns/PhpAsymmetricPropertyPattern.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Tempest\Highlight\Languages\Php\Patterns;
 
 use Tempest\Highlight\IsPattern;
@@ -25,4 +27,4 @@ public function getTokenType(): TokenType
     {
         return TokenTypeEnum::KEYWORD;
     }
-}
\ No newline at end of file
+}