diff --git a/src/core/Loader.php b/src/core/Loader.php
index 491af65..167b6fd 100644
--- a/src/core/Loader.php
+++ b/src/core/Loader.php
@@ -15,15 +15,9 @@ use Exception;
  */
 class Loader
 {
-    /**
-     * Registered classes.
-     * @var array<string, array{class-string|callable(): object, array<int, mixed>, ?callable(object): void}>
-     */
+    /** @var array<string, array{class-string|callable(): object, array<int, mixed>, ?callable(object): void}> */
     protected array $classes = [];
 
-    /** If this is disabled, classes can load with underscores */
-    protected static bool $v2ClassLoading = true;
-
     /** @var array<string, object> Class instances */
     protected array $instances = [];
 
@@ -164,7 +158,7 @@ class Loader
      */
     public static function loadClass(string $class): void
     {
-        $replace_chars = self::$v2ClassLoading ? ['\\', '_'] : ['\\'];
+        $replace_chars = ['\\'];
         $classFile = str_replace($replace_chars, '/', $class) . '.php';
 
         foreach (self::$dirs as $dir) {
@@ -194,14 +188,4 @@ class Loader
             }
         }
     }
-
-
-    /**
-     * Sets the value for V2 class loading.
-     * @param bool $value The value to set for V2 class loading.
-     */
-    public static function setV2ClassLoading(bool $value): void
-    {
-        self::$v2ClassLoading = $value;
-    }
 }
diff --git a/tests/LoaderTest.php b/tests/LoaderTest.php
index de37efa..2ab19b3 100644
--- a/tests/LoaderTest.php
+++ b/tests/LoaderTest.php
@@ -146,23 +146,12 @@ class LoaderTest extends TestCase
                 return self::$dirs;
             }
         };
+
         $loader->addDirectory([__DIR__ . '/classes']);
+
         self::assertEquals([
             dirname(__DIR__),
             __DIR__ . '/classes'
         ], $loader->getDirectories());
     }
-
-    public function testV2ClassLoading(): void
-    {
-        $loader = new class extends Loader {
-            public static function getV2ClassLoading()
-            {
-                return self::$v2ClassLoading;
-            }
-        };
-        $this->assertTrue($loader::getV2ClassLoading());
-        $loader::setV2ClassLoading(false);
-        $this->assertFalse($loader::getV2ClassLoading());
-    }
 }