diff --git a/src/Symfony/Component/HttpKernel/DataCollector/RequestDataCollector.php b/src/Symfony/Component/HttpKernel/DataCollector/RequestDataCollector.php
index 32624c963fa07..3f6150ba9fddf 100644
--- a/src/Symfony/Component/HttpKernel/DataCollector/RequestDataCollector.php
+++ b/src/Symfony/Component/HttpKernel/DataCollector/RequestDataCollector.php
@@ -80,9 +80,9 @@ public function collect(Request $request, Response $response, \Exception $except
         }
 
         $dotenvVars = [];
-        foreach (explode(',', getenv('SYMFONY_DOTENV_VARS')) as $name) {
-            if ('' !== $name && false !== $value = getenv($name)) {
-                $dotenvVars[$name] = $value;
+        foreach (explode(',', $_SERVER['SYMFONY_DOTENV_VARS'] ?? $_ENV['SYMFONY_DOTENV_VARS'] ?? '') as $name) {
+            if ('' !== $name && isset($_ENV[$name])) {
+                $dotenvVars[$name] = $_ENV[$name];
             }
         }