diff --git a/dom/settings/SettingsManager.js b/dom/settings/SettingsManager.js
index c5f1909d7a5be5cc6b85c36b08b7d1ff6797f00a..53e23e1e3413081a46b2eb0e053d796ab1e1ea48 100644
--- a/dom/settings/SettingsManager.js
+++ b/dom/settings/SettingsManager.js
@@ -64,7 +64,7 @@ SettingsDB.prototype = {
     }
 
     let self = this;
-    debug("try to open database:" + DB_NAME + " " + DB_VERSION + " " + this._indexedDB);
+    debug("try to open database:" + DB_NAME + " " + DB_VERSION + " " + this.db);
     let req = aGlobal.mozIndexedDB.open(DB_NAME, DB_VERSION);
     req.onsuccess = function (event) {
       debug("Opened database:", DB_NAME, DB_VERSION);