diff --git a/test/functional/files_controller_test.rb b/test/functional/files_controller_test.rb
index e37cc855e..08fbdf365 100644
--- a/test/functional/files_controller_test.rb
+++ b/test/functional/files_controller_test.rb
@@ -74,7 +74,7 @@ class FilesControllerTest < ActionController::TestCase
     mail = ActionMailer::Base.deliveries.last
     assert_not_nil mail
     assert_equal "[eCookbook] New file", mail.subject
-    assert mail.body.include?('testfile.txt')
+    assert mail.body.to_s.include?('testfile.txt')
   end
 
   def test_create_version_file