diff --git a/symfony/framework-bundle/3.3/config/bootstrap.php b/symfony/framework-bundle/3.3/config/bootstrap.php
index 25e44597d..beb52ca2b 100644
--- a/symfony/framework-bundle/3.3/config/bootstrap.php
+++ b/symfony/framework-bundle/3.3/config/bootstrap.php
@@ -7,7 +7,9 @@
 // Load cached env vars if the .env.local.php file exists
 // Run "composer dump-env prod" to create it (requires symfony/flex >=1.2)
 if (is_array($env = @include dirname(__DIR__).'/.env.local.php')) {
-    $_ENV += $env;
+    foreach ($env as $k => $v) {
+        $_ENV[$k] = $_ENV[$k] ?? (isset($_SERVER[$k]) && 0 !== strpos($k, 'HTTP_') ? $_SERVER[$k] : $v);
+    }
 } elseif (!class_exists(Dotenv::class)) {
     throw new RuntimeException('Please run "composer require symfony/dotenv" to load the ".env" files configuring the application.');
 } else {
diff --git a/symfony/framework-bundle/4.2/config/bootstrap.php b/symfony/framework-bundle/4.2/config/bootstrap.php
index 570bb924e..9c5a99c6e 100644
--- a/symfony/framework-bundle/4.2/config/bootstrap.php
+++ b/symfony/framework-bundle/4.2/config/bootstrap.php
@@ -7,7 +7,9 @@
 // Load cached env vars if the .env.local.php file exists
 // Run "composer dump-env prod" to create it (requires symfony/flex >=1.2)
 if (is_array($env = @include dirname(__DIR__).'/.env.local.php')) {
-    $_ENV += $env;
+    foreach ($env as $k => $v) {
+        $_ENV[$k] = $_ENV[$k] ?? (isset($_SERVER[$k]) && 0 !== strpos($k, 'HTTP_') ? $_SERVER[$k] : $v);
+    }
 } elseif (!class_exists(Dotenv::class)) {
     throw new RuntimeException('Please run "composer require symfony/dotenv" to load the ".env" files configuring the application.');
 } else {