diff --git a/composer.json b/composer.json
index c12e04f..ec07600 100644
--- a/composer.json
+++ b/composer.json
@@ -9,7 +9,7 @@
     }
   ],
   "require": {
-    "php": ">=8.3",
+    "php": ">=8.1",
     "phpstan/phpstan": "^2.0.1"
   },
   "require-dev": {
diff --git a/src/CheckstyleErrorFormatterPhpStorm.php b/src/CheckstyleErrorFormatterPhpStorm.php
index dbffd8d..6014da7 100644
--- a/src/CheckstyleErrorFormatterPhpStorm.php
+++ b/src/CheckstyleErrorFormatterPhpStorm.php
@@ -14,10 +14,18 @@
 use function htmlspecialchars;
 use function sprintf;
 
-/** @api */
-final readonly class CheckstyleErrorFormatterPhpStorm implements ErrorFormatter
+/**
+ * @api
+ * @readonly
+ */
+final class CheckstyleErrorFormatterPhpStorm implements ErrorFormatter
 {
-    public function __construct(private RelativePathHelper $relativePathHelper) {}
+    private RelativePathHelper $relativePathHelper;
+    public function __construct(
+        RelativePathHelper $relativePathHelper
+    ) {
+        $this->relativePathHelper = $relativePathHelper;
+    }
 
     public function formatErrors(
         AnalysisResult $analysisResult,