diff --git a/CHANGELOG b/CHANGELOG
index 3348fc208..209a5fb57 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,6 +1,6 @@
 * 1.38.3 (2019-XX-XX)
 
- * n/a
+ * fixed the bundled Autoloader to also load namespaced classes
 
 * 1.38.2 (2019-03-12)
 
diff --git a/lib/Twig/Autoloader.php b/lib/Twig/Autoloader.php
index 633d7a582..e34e2144f 100644
--- a/lib/Twig/Autoloader.php
+++ b/lib/Twig/Autoloader.php
@@ -45,6 +45,8 @@ class Twig_Autoloader
 
         if (is_file($file = __DIR__.'/../'.str_replace(['_', "\0"], ['/', ''], $class).'.php')) {
             require $file;
+        } elseif (is_file($file = __DIR__.'/../../src/'.str_replace(['Twig\\', '\\', "\0"], ['', '/', ''], $class).'.php')) {
+            require $file;
         }
     }
 }