diff --git a/lib/webrat/selenium/selenium_session.rb b/lib/webrat/selenium/selenium_session.rb
index e2cb766..a2c4ec0 100644
--- a/lib/webrat/selenium/selenium_session.rb
+++ b/lib/webrat/selenium/selenium_session.rb
@@ -54,7 +54,7 @@ module Webrat
     end
 
     def wait_for_ajax(timeout = 15000)
-      @selenium.wait_for_condition "window.Ajax.activeRequestCount == 0", timeout
+      @selenium.wait_for_condition "Ajax.activeRequestCount == 0", timeout
     end
 
     def wait_for_effects(timeout = 15000)