diff --git a/Tests/Command/Descriptor/HtmlDescriptorTest.php b/Tests/Command/Descriptor/HtmlDescriptorTest.php
index 09acf149..156b0a82 100644
--- a/Tests/Command/Descriptor/HtmlDescriptorTest.php
+++ b/Tests/Command/Descriptor/HtmlDescriptorTest.php
@@ -45,7 +45,7 @@ public function testItOutputsStylesAndScriptsOnFirstDescribeCall()
 
         $descriptor->describe($output, new Data([[123]]), ['timestamp' => 1544804268.3668], 1);
 
-        $this->assertStringNotMatchesFormat('<style>%A</style><script>%A</script>%A', $output->fetch(), 'styles & scripts are output only once');
+        $this->assertDoesNotMatchRegularExpression('#<style>(.*?)</style><script>(.*?)</script>(.*)#', $output->fetch(), 'styles & scripts are output only once');
     }
 
     /**