diff --git a/toolkit/locales/en-US/chrome/mozapps/update/updates.properties b/toolkit/locales/en-US/chrome/mozapps/update/updates.properties
index 707f6b0272f..a4991cf60af 100755
--- a/toolkit/locales/en-US/chrome/mozapps/update/updates.properties
+++ b/toolkit/locales/en-US/chrome/mozapps/update/updates.properties
@@ -88,4 +88,4 @@ patchApplyFailure=The Update could not be installed (Patch Apply Failed)
 installPending=Install Pending
 
 updaterIOErrorTitle=Software Update Failed
-updaterIOErrorText=One or more files could not be updated. Please make sure all other applications are closed and that you have permission to modify files, and then restart %S to try again.
+updaterIOErrorMsg=The update could not be installed. Please make sure there are no other copies of %S running on your computer, and then restart %S to try again.
diff --git a/toolkit/mozapps/update/src/nsUpdateService.js.in b/toolkit/mozapps/update/src/nsUpdateService.js.in
index 73f6e251390..95e9faae93e 100644
--- a/toolkit/mozapps/update/src/nsUpdateService.js.in
+++ b/toolkit/mozapps/update/src/nsUpdateService.js.in
@@ -2642,8 +2642,8 @@ UpdatePrompt.prototype = {
             getService(Components.interfaces.nsIStringBundleService);
         var updateBundle = sbs.createBundle(URI_UPDATES_PROPERTIES);
         var title = updateBundle.GetStringFromName("updaterIOErrorTitle");
-        var text = updateBundle.formatStringFromName("updaterIOErrorText",
-                                                     [gApp.name], 1);
+        var text = updateBundle.formatStringFromName("updaterIOErrorMsg",
+                                                     [gApp.name, gApp.name], 2);
         var ww =
             Components.classes["@mozilla.org/embedcomp/window-watcher;1"].
             getService(Components.interfaces.nsIWindowWatcher);