diff --git a/polygerrit-ui/app/elements/admin/gr-permission/gr-permission.js b/polygerrit-ui/app/elements/admin/gr-permission/gr-permission.js
index 6098329..64e156b 100644
--- a/polygerrit-ui/app/elements/admin/gr-permission/gr-permission.js
+++ b/polygerrit-ui/app/elements/admin/gr-permission/gr-permission.js
@@ -37,7 +37,6 @@
 
   Polymer({
     is: 'gr-permission',
-    _legacyUndefinedCheck: true,
 
     properties: {
       labels: Object,
diff --git a/polygerrit-ui/app/elements/admin/gr-rule-editor/gr-rule-editor.js b/polygerrit-ui/app/elements/admin/gr-rule-editor/gr-rule-editor.js
index 4102747..4b01b18 100644
--- a/polygerrit-ui/app/elements/admin/gr-rule-editor/gr-rule-editor.js
+++ b/polygerrit-ui/app/elements/admin/gr-rule-editor/gr-rule-editor.js
@@ -65,7 +65,6 @@
 
   Polymer({
     is: 'gr-rule-editor',
-    _legacyUndefinedCheck: true,
 
     properties: {
       hasRange: Boolean,