diff --git a/tests/Rules/String/SimpleQuote/SingleQuoteRuleTest.php b/tests/Rules/String/SimpleQuote/SingleQuoteRuleTest.php
index 334a64f6..97291fc7 100644
--- a/tests/Rules/String/SimpleQuote/SingleQuoteRuleTest.php
+++ b/tests/Rules/String/SimpleQuote/SingleQuoteRuleTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace TwigCsFixer\Tests\Rules\String\SimpleQuote;
 
 use TwigCsFixer\Rules\String\SingleQuoteRule;