diff --git a/classes/local/form/form_delays_filter.php b/classes/local/form/form_delays_filter.php
index 4c316eb5b5e609580a4b349738e0b9866f207fcb..845e21632d6df92be647ec64439fc6c6372e1c22 100644
--- a/classes/local/form/form_delays_filter.php
+++ b/classes/local/form/form_delays_filter.php
@@ -51,8 +51,11 @@ class form_delays_filter extends \moodleform {
                 'global' => get_string('globally', 'tool_lifecycle')
         ];
         foreach ($activeworkflows as $activeworkflow) {
-            $workflowoptions[$activeworkflow->id] = get_string('delays_for_workflow', 'tool_lifecycle',
+            // Only show non-static workflows.
+            if (workflow_manager::is_disableable($activeworkflow->id)) {
+                $workflowoptions[$activeworkflow->id] = get_string('delays_for_workflow', 'tool_lifecycle',
                     $activeworkflow->displaytitle);
+            }
         }
         $mform->addElement('select', 'workflow', get_string('show_delays', 'tool_lifecycle'), $workflowoptions);