diff --git a/tests/Rule/Nette/RegularExpressionPatternRuleTest.php b/tests/Rule/Nette/RegularExpressionPatternRuleTest.php
index 82053e2..455481f 100644
--- a/tests/Rule/Nette/RegularExpressionPatternRuleTest.php
+++ b/tests/Rule/Nette/RegularExpressionPatternRuleTest.php
@@ -81,6 +81,9 @@ public function testValidRegexPatternAfter73(): void
 		if (PHP_VERSION_ID >= 80200) {
 			$messagePart = 'alphanumeric, backslash, or NUL';
 		}
+		if (PHP_VERSION_ID >= 80400) {
+			$messagePart = 'alphanumeric, backslash, or NUL byte';
+		}
 
 		$this->analyse(
 			[__DIR__ . '/data/valid-regex-pattern.php'],