diff -u b/core/lib/Drupal/Core/Plugin/Discovery/HookDiscovery.php b/core/lib/Drupal/Core/Plugin/Discovery/HookDiscovery.php
--- b/core/lib/Drupal/Core/Plugin/Discovery/HookDiscovery.php
+++ b/core/lib/Drupal/Core/Plugin/Discovery/HookDiscovery.php
@@ -42,7 +42,8 @@
         $this->definitions = array();
 
         foreach (module_implements($this->hook) as $module) {
-          foreach (module_invoke($module, $this->hook) as $plugin_id => $definition) {
+          $function = $module . '_' . $this->hook;
+          foreach ($function() as $plugin_id => $definition) {
             $definition['module'] = $module;
             $this->definitions[$plugin_id] = $definition;
           }