diff --git a/src/Symfony/Component/Debug/DebugClassLoader.php b/src/Symfony/Component/Debug/DebugClassLoader.php
index eb1be7a46dd8..4a02e616cce8 100644
--- a/src/Symfony/Component/Debug/DebugClassLoader.php
+++ b/src/Symfony/Component/Debug/DebugClassLoader.php
@@ -175,7 +175,7 @@ public function loadClass($class)
             $refl = new \ReflectionClass($class);
             $name = $refl->getName();
 
-            if ($name !== $class) {
+            if ($name !== $class && 0 === strcasecmp($name, $class)) {
                 throw new \RuntimeException(sprintf('Case mismatch between loaded and declared class names: %s vs %s', $class, $name));
             }
         }
diff --git a/src/Symfony/Component/Debug/Tests/DebugClassLoaderTest.php b/src/Symfony/Component/Debug/Tests/DebugClassLoaderTest.php
index 12224e029f57..396cc98ee9b7 100644
--- a/src/Symfony/Component/Debug/Tests/DebugClassLoaderTest.php
+++ b/src/Symfony/Component/Debug/Tests/DebugClassLoaderTest.php
@@ -151,6 +151,11 @@ public function testNotPsr0Bis()
     {
         $this->assertTrue(class_exists(__NAMESPACE__.'\Fixtures\NotPSR0bis', true));
     }
+
+    public function testClassAlias()
+    {
+        $this->assertTrue(class_exists(__NAMESPACE__.'\Fixtures\ClassAlias', true));
+    }
 }
 
 class ClassLoader
diff --git a/src/Symfony/Component/Debug/Tests/Fixtures/ClassAlias.php b/src/Symfony/Component/Debug/Tests/Fixtures/ClassAlias.php
new file mode 100644
index 000000000000..9d6dbaa7124f
--- /dev/null
+++ b/src/Symfony/Component/Debug/Tests/Fixtures/ClassAlias.php
@@ -0,0 +1,3 @@
+<?php
+
+class_alias('Symfony\Component\Debug\Tests\Fixtures\NotPSR0bis', 'Symfony\Component\Debug\Tests\Fixtures\ClassAlias');