diff --git a/src/Composer/Autoload/AutoloadGenerator.php b/src/Composer/Autoload/AutoloadGenerator.php
index 57f110a97..c0ebafe61 100644
--- a/src/Composer/Autoload/AutoloadGenerator.php
+++ b/src/Composer/Autoload/AutoloadGenerator.php
@@ -380,7 +380,7 @@ class ComposerAutoloaderInit$suffix
             return self::\$loader;
         }
 
-        spl_autoload_register(array('ComposerAutoloaderInit$suffix', 'loadClassLoader'));
+        spl_autoload_register(array('ComposerAutoloaderInit$suffix', 'loadClassLoader'), true, true);
         self::\$loader = \$loader = new \\Composer\\Autoload\\ClassLoader();
         spl_autoload_unregister(array('ComposerAutoloaderInit$suffix', 'loadClassLoader'));
 
diff --git a/tests/Composer/Test/Autoload/Fixtures/autoload_real_files_by_dependency.php b/tests/Composer/Test/Autoload/Fixtures/autoload_real_files_by_dependency.php
index 3b58316c6..9c4b77c85 100644
--- a/tests/Composer/Test/Autoload/Fixtures/autoload_real_files_by_dependency.php
+++ b/tests/Composer/Test/Autoload/Fixtures/autoload_real_files_by_dependency.php
@@ -19,7 +19,7 @@ class ComposerAutoloaderInitFilesAutoloadOrder
             return self::$loader;
         }
 
-        spl_autoload_register(array('ComposerAutoloaderInitFilesAutoloadOrder', 'loadClassLoader'));
+        spl_autoload_register(array('ComposerAutoloaderInitFilesAutoloadOrder', 'loadClassLoader'), true, true);
         self::$loader = $loader = new \Composer\Autoload\ClassLoader();
         spl_autoload_unregister(array('ComposerAutoloaderInitFilesAutoloadOrder', 'loadClassLoader'));
 
diff --git a/tests/Composer/Test/Autoload/Fixtures/autoload_real_functions.php b/tests/Composer/Test/Autoload/Fixtures/autoload_real_functions.php
index 6080089ec..2ee1040d6 100644
--- a/tests/Composer/Test/Autoload/Fixtures/autoload_real_functions.php
+++ b/tests/Composer/Test/Autoload/Fixtures/autoload_real_functions.php
@@ -19,7 +19,7 @@ class ComposerAutoloaderInitFilesAutoload
             return self::$loader;
         }
 
-        spl_autoload_register(array('ComposerAutoloaderInitFilesAutoload', 'loadClassLoader'));
+        spl_autoload_register(array('ComposerAutoloaderInitFilesAutoload', 'loadClassLoader'), true, true);
         self::$loader = $loader = new \Composer\Autoload\ClassLoader();
         spl_autoload_unregister(array('ComposerAutoloaderInitFilesAutoload', 'loadClassLoader'));
 
diff --git a/tests/Composer/Test/Autoload/Fixtures/autoload_real_include_path.php b/tests/Composer/Test/Autoload/Fixtures/autoload_real_include_path.php
index a410ff688..2378bf0c4 100644
--- a/tests/Composer/Test/Autoload/Fixtures/autoload_real_include_path.php
+++ b/tests/Composer/Test/Autoload/Fixtures/autoload_real_include_path.php
@@ -19,7 +19,7 @@ class ComposerAutoloaderInitIncludePath
             return self::$loader;
         }
 
-        spl_autoload_register(array('ComposerAutoloaderInitIncludePath', 'loadClassLoader'));
+        spl_autoload_register(array('ComposerAutoloaderInitIncludePath', 'loadClassLoader'), true, true);
         self::$loader = $loader = new \Composer\Autoload\ClassLoader();
         spl_autoload_unregister(array('ComposerAutoloaderInitIncludePath', 'loadClassLoader'));
 
diff --git a/tests/Composer/Test/Autoload/Fixtures/autoload_real_target_dir.php b/tests/Composer/Test/Autoload/Fixtures/autoload_real_target_dir.php
index c0fdd07ed..67ef4a9db 100644
--- a/tests/Composer/Test/Autoload/Fixtures/autoload_real_target_dir.php
+++ b/tests/Composer/Test/Autoload/Fixtures/autoload_real_target_dir.php
@@ -19,7 +19,7 @@ class ComposerAutoloaderInitTargetDir
             return self::$loader;
         }
 
-        spl_autoload_register(array('ComposerAutoloaderInitTargetDir', 'loadClassLoader'));
+        spl_autoload_register(array('ComposerAutoloaderInitTargetDir', 'loadClassLoader'), true, true);
         self::$loader = $loader = new \Composer\Autoload\ClassLoader();
         spl_autoload_unregister(array('ComposerAutoloaderInitTargetDir', 'loadClassLoader'));