diff --git a/src/__phutil_library_init__.php b/src/__phutil_library_init__.php
index bcbe5ba..ee442e5 100644
--- a/src/__phutil_library_init__.php
+++ b/src/__phutil_library_init__.php
@@ -1,68 +1,70 @@
 <?php
 
 define('__LIBPHUTIL__', true);
 
 $root = dirname(__FILE__);
 require_once $root.'/moduleutils/core.php';
 require_once $root.'/moduleutils/PhutilBootloader.php';
 require_once $root.'/moduleutils/PhutilBootloaderException.php';
 require_once $root.'/moduleutils/PhutilLibraryConflictException.php';
 
 function __phutil_autoload($class_name) {
   // Occurs in PHP 5.2 with `call_user_func(array($this, 'self::f'))`.
   if ($class_name === 'self' || $class_name === 'parent') {
     return;
   }
 
   try {
     $loader = new PhutilSymbolLoader();
     $symbols = $loader
       ->setType('class')
       ->setName($class_name)
       ->selectAndLoadSymbols();
 
     if (!$symbols) {
       throw new PhutilMissingSymbolException(
         $class_name,
         pht('class or interface'),
         pht(
           "the class or interface '%s' is not defined in the library ".
           "map for any loaded %s library.",
           $class_name,
           'phutil'));
     }
   } catch (PhutilMissingSymbolException $ex) {
     $should_throw = true;
 
     foreach (debug_backtrace() as $backtrace) {
       if (empty($backtrace['function'])) {
         continue;
       }
 
       switch ($backtrace['function']) {
         case 'class_exists':
         case 'interface_exists':
+        case 'method_exists':
+        case 'property_exists':
         case 'trait_exists':
           $should_throw = false;
           break;
       }
     }
 
     if (!$should_throw) {
       return false;
     }
 
     // If there are other SPL autoloaders installed, we need to give them a
     // chance to load the class. Throw the exception if we're the last
     // autoloader; if not, swallow it and let them take a shot.
     $autoloaders = spl_autoload_functions();
     $last = end($autoloaders);
     if ($last == __FUNCTION__) {
       throw $ex;
     }
   }
 }
 
 spl_autoload_register('__phutil_autoload', $throw = true);
 
 phutil_register_library('phutil', __FILE__);