diff --git a/core/lib/Drupal/Component/Plugin/Exception/PluginNotFoundException.php b/core/lib/Drupal/Component/Plugin/Exception/PluginNotFoundException.php
index f2621a8..cb511d7 100644
--- a/core/lib/Drupal/Component/Plugin/Exception/PluginNotFoundException.php
+++ b/core/lib/Drupal/Component/Plugin/Exception/PluginNotFoundException.php
@@ -7,8 +7,6 @@
 
 namespace Drupal\Component\Plugin\Exception;
 
-use Drupal\Component\Utility\String;
-
 /**
  * Plugin exception class to be thrown when a plugin ID could not be found.
  */
@@ -24,7 +22,7 @@ class PluginNotFoundException extends PluginException {
    */
   public function __construct($plugin_id, $message = '', $code = 0, \Exception $previous = NULL) {
     if (empty($message)) {
-      $message = String::format("Plugin ID '@instance' was not found.", array('@instance' => $plugin_id));
+      $message = sprintf("Plugin ID '%s' was not found.", $plugin_id);
     }
     parent::__construct($message, $code, $previous);
   }