diff --git a/app/views/shared/issuable/_sidebar.html.haml b/app/views/shared/issuable/_sidebar.html.haml
index 0520eda37a4..9596c1df20e 100644
--- a/app/views/shared/issuable/_sidebar.html.haml
+++ b/app/views/shared/issuable/_sidebar.html.haml
@@ -133,7 +133,7 @@
         #js-confidential-entry-point
 
       -# haml-lint:disable InlineJavaScript
-      %script#js-lock-issue-data{ type: "application/json" }= { is_locked: issuable_sidebar[:discussion_locked], is_editable: can_edit_issuable }.to_json.html_safe
+      %script#js-lock-issue-data{ type: "application/json" }= { is_locked: !!issuable_sidebar[:discussion_locked], is_editable: can_edit_issuable }.to_json.html_safe
       #js-lock-entry-point
 
       .js-sidebar-participants-entry-point