diff --git a/README.md b/README.md
index 6a8cb08..0d35346 100644
--- a/README.md
+++ b/README.md
@@ -187,9 +187,14 @@ provided in this library:
 ```php
 <?php 
 use Dbalabka\StaticConstructorLoader\StaticConstructorLoader;
+use Dbalabka\StaticConstructorLoader\DebugStaticConstructorLoader;
 
 $composer = require_once(__DIR__ . '/vendor/autoload.php');
-$loader = new StaticConstructorLoader($composer);
+if ($_ENV['APP_ENV'] === 'dev') { // if running Symfony with dev-mode
+    $loader = new DebugStaticConstructorLoader(new StaticConstructorLoader($composer));
+} else {
+    $loader = new StaticConstructorLoader($composer);
+}
 ``` 
 Also, it would be very helpful to have expression based properties initialization:
 ```php
diff --git a/composer.json b/composer.json
index b00f6e4..9d6ca66 100644
--- a/composer.json
+++ b/composer.json
@@ -16,7 +16,8 @@
         "myclabs/php-enum": "^1.0",
         "phpunit/phpunit": "^7.5",
         "phpbench/phpbench": "^0.16.9",
-        "vimeo/psalm": "^3.5"
+        "vimeo/psalm": "^3.5",
+        "symfony/error-handler": "^5.1"
     },
     "autoload": {
         "psr-4": {
diff --git a/src/StaticConstructorLoader/DebugStaticConstructorLoader.php b/src/StaticConstructorLoader/DebugStaticConstructorLoader.php
new file mode 100644
index 0000000..36ac489
--- /dev/null
+++ b/src/StaticConstructorLoader/DebugStaticConstructorLoader.php
@@ -0,0 +1,185 @@
+<?php declare(strict_types=1);
+
+namespace Dbalabka\StaticConstructorLoader;
+
+use Composer\Autoload\ClassLoader;
+use Dbalabka\StaticConstructorLoader\Exception\StaticConstructorLoaderException;
+
+class DebugStaticConstructorLoader extends ClassLoader /* extending for an contract */
+{
+    /**
+     * @var ClassLoader
+     */
+    private $classLoader;
+
+    public function __construct(ClassLoader $classLoader)
+    {
+        $this->classLoader = $classLoader;
+
+        // find Composer autoloader
+        $loaders = spl_autoload_functions();
+        $otherLoaders = [];
+        $composerLoader = null;
+        foreach ($loaders as $loader) {
+            if (is_array($loader)) {
+                if ($loader[0] === $classLoader) {
+                    $composerLoader = $loader;
+                    break;
+                }
+                if ($loader[0] instanceof self) {
+                    throw new StaticConstructorLoaderException(sprintf('%s already registered', self::class));
+                }
+            }
+            $otherLoaders[] = $loader;
+        }
+
+        if (!$composerLoader) {
+            throw new StaticConstructorLoaderException(sprintf('%s was not found in registered autoloaders', ClassLoader::class));
+        }
+
+        // unregister Composer autoloader and all preceding autoloaders
+        array_map('spl_autoload_unregister', array_merge($otherLoaders, [$composerLoader]));
+
+        // restore the original queue order
+        $loadersToRestore = array_merge([[$this, 'loadClass']], array_reverse($otherLoaders));
+        $flagTrue = array_fill(0, count($loadersToRestore), true);
+        array_map('spl_autoload_register', $loadersToRestore, $flagTrue, $flagTrue);
+    }
+
+    public function loadClass($className): ?bool
+    {
+        return $this->classLoader->loadClass($className);
+    }
+
+    public function getPrefixes()
+    {
+        return $this->classLoader->getPrefixes();
+    }
+
+    public function getPrefixesPsr4()
+    {
+        return $this->classLoader->getPrefixesPsr4();
+    }
+
+    public function getFallbackDirs()
+    {
+        return $this->classLoader->getFallbackDirs();
+    }
+
+    public function getFallbackDirsPsr4()
+    {
+        return $this->classLoader->getFallbackDirsPsr4();
+    }
+
+    public function getClassMap()
+    {
+        return $this->classLoader->getClassMap();
+    }
+
+    public function addClassMap(array $classMap)
+    {
+        $this->classLoader->addClassMap($classMap);
+    }
+
+    public function add($prefix, $paths, $prepend = false)
+    {
+        $this->classLoader->add($prefix, $paths, $prepend);
+    }
+
+    public function addPsr4($prefix, $paths, $prepend = false)
+    {
+        $this->classLoader->addPsr4($prefix, $paths, $prepend);
+    }
+
+    public function set($prefix, $paths)
+    {
+        $this->classLoader->set($prefix, $paths);
+    }
+
+    public function setPsr4($prefix, $paths)
+    {
+        $this->classLoader->setPsr4($prefix, $paths);
+    }
+
+    public function setUseIncludePath($useIncludePath)
+    {
+        $this->classLoader->setUseIncludePath($useIncludePath);
+    }
+
+    public function getUseIncludePath()
+    {
+        return $this->classLoader->getUseIncludePath();
+    }
+
+    public function setClassMapAuthoritative($classMapAuthoritative)
+    {
+        $this->classLoader->setClassMapAuthoritative($classMapAuthoritative);
+    }
+
+    public function isClassMapAuthoritative()
+    {
+        return $this->classLoader->isClassMapAuthoritative();
+    }
+
+    public function setApcuPrefix($apcuPrefix)
+    {
+        $this->classLoader->setApcuPrefix($apcuPrefix);
+    }
+
+    public function getApcuPrefix()
+    {
+        return $this->classLoader->getApcuPrefix();
+    }
+
+    public function register($prepend = false)
+    {
+        $this->classLoader->register($prepend);
+    }
+
+    public function unregister()
+    {
+        $this->classLoader->unregister();
+    }
+
+    public function findFile($class)
+    {
+        $path = $this->classLoader->findFile($class);
+
+        if (
+            class_exists('Symfony\Component\ErrorHandler\DebugClassLoader', false)
+            || class_exists('Symfony\Component\Debug\DebugClassLoader', false)
+        ) {
+            return $this->handleDebugClassLoader($class, $path);
+        }
+
+        return $path;
+    }
+
+    private function handleDebugClassLoader($class, $path)
+    {
+        $backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 3);
+        $debugClassLoader = ($backtrace[2] ?? null);
+
+        if ($path
+            && is_file($path)
+            && \in_array(
+                $debugClassLoader['class'] ?? null,
+                ['Symfony\Component\Debug\DebugClassLoader', 'Symfony\Component\ErrorHandler\DebugClassLoader'],
+                true
+            )
+        ) {
+            include $path;
+
+            if (
+                $class !== StaticConstructorInterface::class
+                && is_a($class, StaticConstructorInterface::class, true)
+            ) {
+                $class::__constructStatic();
+            }
+
+            return false;
+        }
+
+        return $path;
+    }
+}
\ No newline at end of file
diff --git a/tests/StaticConstructorLoader/DebugStaticConstructorLoaderTest.php b/tests/StaticConstructorLoader/DebugStaticConstructorLoaderTest.php
new file mode 100644
index 0000000..4fcc394
--- /dev/null
+++ b/tests/StaticConstructorLoader/DebugStaticConstructorLoaderTest.php
@@ -0,0 +1,57 @@
+<?php declare(strict_types=1);
+
+namespace Dbalabka\Enumeration\Tests\StaticConstructorLoader;
+
+use Dbalabka\StaticConstructorLoader\DebugStaticConstructorLoader;
+use Dbalabka\StaticConstructorLoader\StaticConstructorLoader;
+use Dbalabka\StaticConstructorLoader\Tests\Fixtures\ChildOfAbstractEnumeration;
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\ErrorHandler\DebugClassLoader;
+
+class DebugStaticConstructorLoaderTest extends TestCase
+{
+    /** @var callable */
+    private $defaultLoader;
+
+    protected function setUp()
+    {
+        $this->defaultLoader = \spl_autoload_functions()[0];
+    }
+
+    protected function tearDown()
+    {
+        DebugClassLoader::disable();
+    }
+
+    /**
+     * @runInSeparateProcess
+     */
+    public function testClassLoadWithDefaultStaticConstrcutorLoader()
+    {
+        new StaticConstructorLoader($this->defaultLoader[0]);
+        $x = ChildOfAbstractEnumeration::$instance;
+        $this->assertInstanceOf(ChildOfAbstractEnumeration::class, $x);
+    }
+
+    /**
+     * @runInSeparateProcess
+     */
+    public function testClassLoadWithDefaultStaticConstrcutorLoaderAndSymfonyDebugLoader()
+    {
+        new StaticConstructorLoader($this->defaultLoader[0]);
+        (new DebugClassLoader($this->defaultLoader))::enable();
+        $x = ChildOfAbstractEnumeration::$instance;
+        $this->assertNull($x);
+    }
+
+    /**
+     * @runInSeparateProcess
+     */
+    public function testClassLoadWithDebugStaticConstrcutorLoaderAndSymfonyDebugLoader()
+    {
+        new DebugStaticConstructorLoader($this->defaultLoader[0]);
+        (new DebugClassLoader($this->defaultLoader))::enable();
+        $x = ChildOfAbstractEnumeration::$instance;
+        $this->assertInstanceOf(ChildOfAbstractEnumeration::class, $x);
+    }
+}