diff --git a/b2g/components/UpdatePrompt.js b/b2g/components/UpdatePrompt.js
index e11f286bdbd..0a3059d319e 100644
--- a/b2g/components/UpdatePrompt.js
+++ b/b2g/components/UpdatePrompt.js
@@ -96,11 +96,6 @@ UpdateCheckListener.prototype = {
 
     Services.aus.QueryInterface(Ci.nsIUpdateCheckListener);
     Services.aus.onError(request, update);
-  },
-
-  onProgress: function UCL_onProgress(request, position, totalSize) {
-    Services.aus.QueryInterface(Ci.nsIUpdateCheckListener);
-    Services.aus.onProgress(request, position, totalSize);
   }
 };
 
diff --git a/browser/base/content/aboutDialog.js b/browser/base/content/aboutDialog.js
index 23f2e70d04a..7b6f870df2a 100644
--- a/browser/base/content/aboutDialog.js
+++ b/browser/base/content/aboutDialog.js
@@ -282,17 +282,10 @@ appUpdater.prototype =
 
   /**
    * Implements nsIUpdateCheckListener. The methods implemented by
-   * nsIUpdateCheckListener have to be in a different scope from
-   * nsIIncrementalDownload because both nsIUpdateCheckListener and
-   * nsIIncrementalDownload implement onProgress.
+   * nsIUpdateCheckListener are in a different scope from nsIIncrementalDownload
+   * to make it clear which are used by each interface.
    */
   updateCheckListener: {
-    /**
-     * See nsIUpdateService.idl
-     */
-    onProgress: function(aRequest, aPosition, aTotalSize) {
-    },
-
     /**
      * See nsIUpdateService.idl
      */
diff --git a/toolkit/mozapps/update/content/updates.js b/toolkit/mozapps/update/content/updates.js
index 9dd397c8bdb..b03430550ed 100644
--- a/toolkit/mozapps/update/content/updates.js
+++ b/toolkit/mozapps/update/content/updates.js
@@ -612,15 +612,6 @@ var gCheckingPage = {
    * update check commences.
    */
   updateListener: {
-    /**
-     * See nsIUpdateCheckListener
-     */
-    onProgress: function(request, position, totalSize) {
-      var pm = document.getElementById("checkingProgress");
-      pm.mode = "normal";
-      pm.value = Math.floor(100 * (position / totalSize));
-    },
-
     /**
      * See nsIUpdateCheckListener
      */
diff --git a/toolkit/mozapps/update/nsIUpdateService.idl b/toolkit/mozapps/update/nsIUpdateService.idl
index 4eb3d7375bd..d5068b839de 100644
--- a/toolkit/mozapps/update/nsIUpdateService.idl
+++ b/toolkit/mozapps/update/nsIUpdateService.idl
@@ -277,23 +277,9 @@ interface nsIUpdate : nsISupports
  * check operation. This object is notified as the check continues, finishes
  * and if it has an error.
  */
-[scriptable, uuid(8cbceb6e-8e27-46f2-8808-444c6499f836)]
+[scriptable, uuid(4aa2b4bb-39ea-407b-98ff-89f19134d4c0)]
 interface nsIUpdateCheckListener : nsISupports
 {
-  /**
-   * Called every time there is a progress notification loading the Update
-   * Service file.
-   * @param   request
-   *          The nsIXMLHttpRequest handling the update check.
-   * @param   position
-   *          The current byte downloaded
-   * @param   totalSize
-   *          The total number of bytes that have to be downloaded
-   */
-  void onProgress(in nsIXMLHttpRequest request,
-                  in unsigned long position,
-                  in unsigned long totalSize);
-
   /**
    * The update check was completed.
    * @param   request
diff --git a/toolkit/mozapps/update/nsUpdateService.js b/toolkit/mozapps/update/nsUpdateService.js
index 6893f186dfc..1e8851a66ab 100644
--- a/toolkit/mozapps/update/nsUpdateService.js
+++ b/toolkit/mozapps/update/nsUpdateService.js
@@ -2091,10 +2091,6 @@ UpdateService.prototype = {
     this._attemptResume();
   },
 
-  // nsIUpdateCheckListener
-  onProgress: function AUS_onProgress(request, position, totalSize) {
-  },
-
   onCheckComplete: function AUS_onCheckComplete(request, updates, updateCount) {
     this._selectAndInstallUpdate(updates);
   },
@@ -3077,7 +3073,6 @@ Checker.prototype = {
     var self = this;
     this._request.addEventListener("error", function(event) { self.onError(event); } ,false);
     this._request.addEventListener("load", function(event) { self.onLoad(event); }, false);
-    this._request.addEventListener("progress", function(event) { self.onProgress(event); }, false);
 
     LOG("Checker:checkForUpdates - sending request to: " + url);
     this._request.send(null);
@@ -3085,16 +3080,6 @@ Checker.prototype = {
     this._callback = listener;
   },
 
-  /**
-   * When progress associated with the XMLHttpRequest is received.
-   * @param   event
-   *          The nsIDOMLSProgressEvent for the load.
-   */
-  onProgress: function UC_onProgress(event) {
-    LOG("Checker:onProgress - " + event.position + "/" + event.totalSize);
-    this._callback.onProgress(event.target, event.position, event.totalSize);
-  },
-
   /**
    * Returns an array of nsIUpdate objects discovered by the update check.
    * @throws if the XML document element node name is not updates.
@@ -3214,7 +3199,7 @@ Checker.prototype = {
   /**
    * There was an error of some kind during the XMLHttpRequest
    * @param   event
-   *          The nsIDOMEvent for the load
+   *          The nsIDOMEvent for the error
    */
   onError: function UC_onError(event) {
     var request = event.target;