diff --git a/lib/deprecation_collector/deprecation-ids.yml b/lib/deprecation_collector/deprecation-ids.yml
index 67eecf9..1fd77b9 100644
--- a/lib/deprecation_collector/deprecation-ids.yml
+++ b/lib/deprecation_collector/deprecation-ids.yml
@@ -87,6 +87,7 @@ discourse_deprecation_ids:
 - discourse.section-link-class-arg
 - discourse.select-kit
 - discourse.show-popover
+- discourse.singleton-mixin
 - discourse.tag-show-controller
 - discourse.text.cook-async
 - discourse.this-container