diff --git a/common/content/completion.js b/common/content/completion.js
index fade644a..60dc0af6 100644
--- a/common/content/completion.js
+++ b/common/content/completion.js
@@ -1651,7 +1651,7 @@ function Completion() //{{{
             context.anchored = false;
             context.title = ["Firefox Preference", "Value"];
             context.keys = { text: function (item) item, description: function (item) options.getPref(item) };
-            context.completions = service["prefs"].getChildList("", { value: 0 });
+            context.completions = service["pref"].getChildList("", { value: 0 });
         },
 
         search: function search(context, noSuggest)