diff --git a/src/js/background.js b/src/js/background.js
index 6f66cef52b4bc..32a07ad7aa9c0 100644
--- a/src/js/background.js
+++ b/src/js/background.js
@@ -81,7 +81,7 @@ const hiddenSettingsDefault = {
     selfieAfter: 3,
     strictBlockingBypassDuration: 120,
     suspendTabsUntilReady: 'unset',
-    uiPopupConfig: 'undocumented',
+    uiPopupConfig: 'unset',
     uiFlavor: 'unset',
     uiStyles: 'unset',
     uiTheme: 'unset',
diff --git a/src/js/messaging.js b/src/js/messaging.js
index a85d77ca83076..5d56774b47218 100644
--- a/src/js/messaging.js
+++ b/src/js/messaging.js
@@ -364,7 +364,7 @@ const popupDataFromTabId = function(tabId, tabTitle) {
         tooltipsDisabled: µbus.tooltipsDisabled
     };
 
-    if ( µbhs.uiPopupConfig !== 'undocumented' ) {
+    if ( µbhs.uiPopupConfig !== 'unset' ) {
         r.uiPopupConfig = µbhs.uiPopupConfig;
     }