diff --git a/src/Symfony/Component/ClassLoader/ClassCollectionLoader.php b/src/Symfony/Component/ClassLoader/ClassCollectionLoader.php
index 6a0ea6b8f8..f1e74ce00d 100644
--- a/src/Symfony/Component/ClassLoader/ClassCollectionLoader.php
+++ b/src/Symfony/Component/ClassLoader/ClassCollectionLoader.php
@@ -96,7 +96,7 @@ class ClassCollectionLoader
         $files = array();
         $content = '';
         foreach (self::getOrderedClasses($classes) as $class) {
-            if (in_array($class->getName(), $declared)) {
+            if ($adaptive && in_array($class->getName(), $declared)) {
                 continue;
             }