diff --git a/common/content/tabs.js b/common/content/tabs.js
index 0506a381..4a4de4e0 100644
--- a/common/content/tabs.js
+++ b/common/content/tabs.js
@@ -285,7 +285,7 @@ function Tabs() //{{{
             { count: true });
 
         // TODO: feature dependencies - implies "session"?
-        if (liberator.has("tabUndo"))
+        if (liberator.has("tabs_undo"))
         {
             mappings.add([modes.NORMAL], ["u"],
                 "Undo closing of a tab",
@@ -609,7 +609,7 @@ function Tabs() //{{{
             });
     }
 
-    if (liberator.has("tabUndo"))
+    if (liberator.has("tabs_undo"))
     {
         commands.add(["u[ndo]"],
             "Undo closing of a tab",
diff --git a/vimperator/content/config.js b/vimperator/content/config.js
index ea62ba30..9e73e3ac 100644
--- a/vimperator/content/config.js
+++ b/vimperator/content/config.js
@@ -32,7 +32,7 @@ const config = { //{{{
     hostApplication: "Firefox",
 
     /*** optional options, there are checked for existence and a fallback provided  ***/
-    features: ["bookmarks", "hints", "history", "marks", "quickmarks", "session", "tabs", "tabUndo", "windows"],
+    features: ["bookmarks", "hints", "history", "marks", "quickmarks", "session", "tabs", "tabs_undo", "windows"],
     defaults: {
         guioptions: "rb",
         showtabline: 2,