diff --git a/rules.module b/rules.module
index 719852c..7bff7cb 100644
--- a/rules.module
+++ b/rules.module
@@ -4,6 +4,13 @@
  * @file Rules engine module
  */
 
+// Drupal's class autoloader fails for classes added in 7.x-2.4 (Issue 2090511).
+// Trigger a registry rebuild if needed.
+if (!drupal_autoload_class('RulesEventHandlerEntityBundle')) {
+  system_rebuild_module_data();
+  registry_update();
+}
+
 // Include our hook implementations early, as they can be called even before
 // hook_init().
 require_once dirname(__FILE__) . '/modules/events.inc';