diff --git a/railties/lib/rails/backtrace_cleaner.rb b/railties/lib/rails/backtrace_cleaner.rb
index ffc5ef42aa84f..88df0ebbda6a4 100644
--- a/railties/lib/rails/backtrace_cleaner.rb
+++ b/railties/lib/rails/backtrace_cleaner.rb
@@ -1,14 +1,13 @@
 module Rails
   class BacktraceCleaner < ActiveSupport::BacktraceCleaner
     ERB_METHOD_SIG = /:in `_run_erb_.*/
-    
+
     VENDOR_DIRS  = %w( vendor/plugins vendor/gems vendor/rails )
     MONGREL_DIRS = %w( lib/mongrel bin/mongrel )
     RAILS_NOISE  = %w( script/server )
     RUBY_NOISE   = %w( rubygems/custom_require benchmark.rb )
 
     ALL_NOISE    = VENDOR_DIRS + MONGREL_DIRS + RAILS_NOISE + RUBY_NOISE
-  
 
     def initialize
       super
@@ -18,15 +17,14 @@ def initialize
     end
   end
 
-
   # For installing the BacktraceCleaner in the test/unit
   module BacktraceFilterForTestUnit #:nodoc:
     def self.included(klass)
       klass.send :alias_method_chain, :filter_backtrace, :cleaning
     end
-  
-    def filter_backtrace_with_cleaning(backtrace)
-      backtrace = filter_backtrace_without_cleaning(backtrace)
+
+    def filter_backtrace_with_cleaning(backtrace, prefix=nil)
+      backtrace = filter_backtrace_without_cleaning(backtrace, prefix)
       backtrace = backtrace.first.split("\n") if backtrace.size == 1
       Rails.backtrace_cleaner.clean(backtrace)
     end
diff --git a/railties/test/abstract_unit.rb b/railties/test/abstract_unit.rb
index 516ab8523e38d..b6edc033911c5 100644
--- a/railties/test/abstract_unit.rb
+++ b/railties/test/abstract_unit.rb
@@ -9,6 +9,7 @@
 require 'mocha'
 require 'stringio'
 require 'active_support'
+require 'active_support/test_case'
 
 def uses_mocha(test_name)
   yield
@@ -18,4 +19,4 @@ def uses_mocha(test_name)
   RAILS_ROOT.replace File.dirname(__FILE__)
 else
   RAILS_ROOT = File.dirname(__FILE__)
-end
+end
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diff --git a/railties/test/backtrace_cleaner_test.rb b/railties/test/backtrace_cleaner_test.rb
new file mode 100644
index 0000000000000..5955fd2856236
--- /dev/null
+++ b/railties/test/backtrace_cleaner_test.rb
@@ -0,0 +1,28 @@
+require 'abstract_unit'
+
+require 'initializer'
+require 'rails/backtrace_cleaner'
+
+class TestWithBacktrace
+  include Test::Unit::Util::BacktraceFilter
+  include Rails::BacktraceFilterForTestUnit
+end
+
+class BacktraceCleanerFilterTest < ActiveSupport::TestCase
+  def setup
+    @test = TestWithBacktrace.new
+    @backtrace = [ './test/rails/benchmark_test.rb', './test/rails/dependencies.rb', '/opt/local/lib/ruby/kernel.rb' ]
+  end
+  
+  test "test with backtrace should use the rails backtrace cleaner to clean" do
+    Rails.stubs(:backtrace_cleaner).returns(stub(:clean))
+    Rails.backtrace_cleaner.expects(:clean).with(@backtrace, nil)
+    @test.filter_backtrace(@backtrace)
+  end
+  
+  test "filter backtrace should have the same arity as Test::Unit::Util::BacktraceFilter" do
+    assert_nothing_raised do
+      @test.filter_backtrace(@backtrace, '/opt/local/lib')
+    end
+  end
+end
\ No newline at end of file