diff --git a/docs/4-Configuration.md b/docs/4-Configuration.md
index 27e86f64..f88e3989 100644
--- a/docs/4-Configuration.md
+++ b/docs/4-Configuration.md
@@ -1011,7 +1011,3 @@ For example, the following command set the website’s `baseurl`:
 ```bash
 export CECIL_BASEURL="https://example.com/"
 ```
-
-:::important
-Only existing configuration options can be overridden: you can’t create new configuration options with environment variables.
-:::
diff --git a/src/Config.php b/src/Config.php
index f9392c04..edaa8828 100644
--- a/src/Config.php
+++ b/src/Config.php
@@ -72,8 +72,8 @@ public function __construct(?array $config = null)
     public function import(array $config, $mode = self::MERGE): void
     {
         $this->data->import($config, $mode);
+        $this->setFromEnv();
         $this->validate();
-        $this->override();
     }
 
     /**
@@ -540,30 +540,15 @@ public function isCacheDirIsAbsolute(): bool
     }
 
     /**
-     * Overrides configuration with environment variables.
+     * Set configuration from environment variables.
      */
-    private function override(): void
+    private function setFromEnv(): void
     {
-        $data = $this->data;
-        $applyEnv = function ($array) use ($data) {
-            $iterator = new \RecursiveIteratorIterator(
-                new \RecursiveArrayIterator($array),
-                \RecursiveIteratorIterator::SELF_FIRST
-            );
-            $iterator->rewind();
-            while ($iterator->valid()) {
-                $path = [];
-                foreach (range(0, $iterator->getDepth()) as $depth) {
-                    $path[] = $iterator->getSubIterator($depth)->key();
-                }
-                $sPath = implode('_', $path);
-                if ($getEnv = getenv('CECIL_' . strtoupper($sPath))) {
-                    $data->set(str_replace('_', '.', strtolower($sPath)), $this->castSetValue($getEnv));
-                }
-                $iterator->next();
+        foreach (getenv() as $key => $value) {
+            if (str_starts_with($key, 'CECIL_')) {
+                $this->data->set(str_replace(['cecil_', '_'], ['', '.'], strtolower($key)), $this->castSetValue($value));
             }
-        };
-        $applyEnv($data->export());
+        }
     }
 
     /**
diff --git a/tests/IntegrationTests.php b/tests/IntegrationTests.php
index c36e6795..d456be67 100644
--- a/tests/IntegrationTests.php
+++ b/tests/IntegrationTests.php
@@ -42,8 +42,8 @@ public function tearDown(): void
     public function testBuid()
     {
         putenv('CECIL_DEBUG=true');
-        putenv('CECIL_TITLE=Cecil');
-        putenv('CECIL_DESCRIPTION=Description (env. variable)');
+        putenv('CECIL_TITLE=Cecil (env)');
+        putenv('CECIL_DESCRIPTION=Description (env)');
         echo "\n";
         Builder::create(
             require($this->config),
diff --git a/tests/fixtures/website/config.php b/tests/fixtures/website/config.php
index 1a051f19..4a7d563a 100644
--- a/tests/fixtures/website/config.php
+++ b/tests/fixtures/website/config.php
@@ -1,7 +1,6 @@
 <?php
 
 return [
-    'debug'      => true,
     'title'      => 'Cecil test',
     'taxonomies' => [
         'tests' => 'disabled',