diff --git a/actionpack/lib/action_controller/code_generation.rb b/actionpack/lib/action_controller/code_generation.rb
index d2d7deb212..de11d4a496 100644
--- a/actionpack/lib/action_controller/code_generation.rb
+++ b/actionpack/lib/action_controller/code_generation.rb
@@ -187,7 +187,7 @@ def hash_value(key, assign = true, default = nil)
             locals << local_name(key)
           end
         end
-        code = "(#{code} || #{default.inspect})" if default
+        code = "(#{code} || (#{default.inspect}))" if default
         return code
       end 
     
diff --git a/actionpack/test/controller/routing_test.rb b/actionpack/test/controller/routing_test.rb
index 0a9453e86a..3687b6ac77 100644
--- a/actionpack/test/controller/routing_test.rb
+++ b/actionpack/test/controller/routing_test.rb
@@ -1,5 +1,6 @@
 require File.dirname(__FILE__) + '/../abstract_unit'
 require 'test/unit'
+require 'stringio'
 
 RunTimeTests = ARGV.include? 'time'
 
@@ -629,6 +630,17 @@ def test_route_with_colon_first
     end
   end
 
+  def test_route_generating_string_literal_in_comparison_warning
+    old_stderr = $stderr
+    $stderr = StringIO.new
+    rs.draw do |map|
+      map.connect 'subscriptions/:action/:subscription_type', :controller => "subscriptions"
+    end
+    assert_equal "", $stderr.string
+  ensure
+    $stderr = old_stderr
+  end
+
   def test_basic_named_route
     rs.home '', :controller => 'content', :action => 'list' 
     x = setup_for_named_route