diff --git a/test/tests/test_rescanner.rb b/test/tests/test_rescanner.rb
index 006760fbaec2f19f1fb24aad34bfb746f341c151..48dbd26cbe3270631ffaf8b135014abbec1a155f 100644
--- a/test/tests/test_rescanner.rb
+++ b/test/tests/test_rescanner.rb
@@ -188,7 +188,7 @@ class RescannerTests < Test::Unit::TestCase
   def test_remove_route
     routes = "config/routes.rb"
 
-    before_rescan_of routes do
+    before_rescan_of routes, "rails3.2", :assume_all_routes => false do
       replace routes, "match 'implicit' => 'removal#implicit_render'", ""
     end