diff --git a/workflow/engine/classes/TriggerLibrary.php b/workflow/engine/classes/TriggerLibrary.php
index 8a26f5d83..134828c5d 100644
--- a/workflow/engine/classes/TriggerLibrary.php
+++ b/workflow/engine/classes/TriggerLibrary.php
@@ -1,4 +1,5 @@
 <?php
+use ProcessMaker\Plugins\PluginRegistry;
 
 class TriggerLibrary
 {