diff --git a/src/Symfony/Component/Dotenv/Command/DebugCommand.php b/src/Symfony/Component/Dotenv/Command/DebugCommand.php
index 237d7b7cfd228..55585e8a722e3 100644
--- a/src/Symfony/Component/Dotenv/Command/DebugCommand.php
+++ b/src/Symfony/Component/Dotenv/Command/DebugCommand.php
@@ -50,7 +50,9 @@ protected function execute(InputInterface $input, OutputInterface $output): int
             return 1;
         }
 
-        $filePath = $this->projectDirectory.\DIRECTORY_SEPARATOR.'.env';
+        $composerFile = $this->projectDirectory . '/composer.json';
+        $config = (is_file($composerFile) ? json_decode(file_get_contents($composerFile), true) : [])['extra']['runtime'] ?? [];
+        $filePath = $this->projectDirectory.'/'.($config['dotenv_path'] ?? '.env');
         $envFiles = $this->getEnvFiles($filePath);
         $availableFiles = array_filter($envFiles, 'is_file');
 
diff --git a/src/Symfony/Component/Dotenv/Tests/Command/DebugCommandTest.php b/src/Symfony/Component/Dotenv/Tests/Command/DebugCommandTest.php
index 001baec0c2539..64ad618dfffec 100644
--- a/src/Symfony/Component/Dotenv/Tests/Command/DebugCommandTest.php
+++ b/src/Symfony/Component/Dotenv/Tests/Command/DebugCommandTest.php
@@ -167,10 +167,27 @@ public function testWarningOnPhpEnvFile()
         $this->assertStringContainsString('[WARNING] Due to existing dump file (.env.local.php)', $output);
     }
 
-    private function executeCommand(string $projectDirectory, string $env): string
+    public function testLoadEnvFilesFromSubdirectory()
+    {
+        $projectDirectory = __DIR__.'/Fixtures/Scenario4';
+        file_put_contents($projectDirectory.'/composer.json', '{"extra":{"runtime":{"dotenv_path": "config/.env"}}}');
+
+        $output = $this->executeCommand($projectDirectory, 'dev', 'config/.env');
+
+        @unlink($projectDirectory.'/composer.json');
+
+        // Scanned Files
+        $this->assertStringContainsString('⨯ config/.env.local.php', $output);
+        $this->assertStringContainsString('⨯ config/.env.dev.local', $output);
+        $this->assertStringContainsString('⨯ config/.env.dev', $output);
+        $this->assertStringContainsString('✓ config/.env.local', $output);
+        $this->assertStringContainsString('✓ config/.env'.\PHP_EOL, $output);
+    }
+
+    private function executeCommand(string $projectDirectory, string $env, string $envPath = '.env'): string
     {
         $_SERVER['TEST_ENV_KEY'] = $env;
-        (new Dotenv('TEST_ENV_KEY'))->bootEnv($projectDirectory.'/.env');
+        (new Dotenv('TEST_ENV_KEY'))->bootEnv($projectDirectory.'/'.$envPath);
 
         $command = new DebugCommand($env, $projectDirectory);
         $command->setHelperSet(new HelperSet([new FormatterHelper()]));
diff --git a/src/Symfony/Component/Dotenv/Tests/Command/Fixtures/Scenario4/config/.env b/src/Symfony/Component/Dotenv/Tests/Command/Fixtures/Scenario4/config/.env
new file mode 100644
index 0000000000000..dbc9b1ecab0ea
--- /dev/null
+++ b/src/Symfony/Component/Dotenv/Tests/Command/Fixtures/Scenario4/config/.env
@@ -0,0 +1,2 @@
+TEST123=true
+FOO=bar
diff --git a/src/Symfony/Component/Dotenv/Tests/Command/Fixtures/Scenario4/config/.env.local b/src/Symfony/Component/Dotenv/Tests/Command/Fixtures/Scenario4/config/.env.local
new file mode 100644
index 0000000000000..c6a735ee12086
--- /dev/null
+++ b/src/Symfony/Component/Dotenv/Tests/Command/Fixtures/Scenario4/config/.env.local
@@ -0,0 +1 @@
+FOO=baz