diff --git a/app/Services/HtmlValidator.php b/app/Services/HtmlValidator.php
index 019147d..31bb31f 100644
--- a/app/Services/HtmlValidator.php
+++ b/app/Services/HtmlValidator.php
@@ -10,7 +10,7 @@ public static function validateSource(string $html)
     {
         $response = Http::withHeaders([
             'Content-Type' => 'text/html; charset=utf-8',
-        ])->withBody($html, 'text/html')->post('http://nu-validator:8888/?out=json');
+        ])->withBody($html, 'text/html')->post(env('HTML5_VALIDATOR_URL') . '/?out=json');
 
         $json = $response->json();