diff --git a/gemfiles/activesupport3.2.gemfile b/gemfiles/activesupport3.2.gemfile
index 61efc24..a79d34e 100644
--- a/gemfiles/activesupport3.2.gemfile
+++ b/gemfiles/activesupport3.2.gemfile
@@ -3,5 +3,6 @@
 source "https://rubygems.org"
 
 gem "activesupport", "~> 3.2.0"
+gem "actionpack", "~> 3.2.0"
 
 gemspec :path => "../"
diff --git a/gemfiles/activesupport4.0.gemfile b/gemfiles/activesupport4.0.gemfile
index 697ad67..3e6650c 100644
--- a/gemfiles/activesupport4.0.gemfile
+++ b/gemfiles/activesupport4.0.gemfile
@@ -3,5 +3,6 @@
 source "https://rubygems.org"
 
 gem "activesupport", "~> 4.0.0"
+gem "actionpack", "~> 4.0.0"
 
 gemspec :path => "../"
diff --git a/gemfiles/activesupport4.1.gemfile b/gemfiles/activesupport4.1.gemfile
index 670c4f8..a64a9dd 100644
--- a/gemfiles/activesupport4.1.gemfile
+++ b/gemfiles/activesupport4.1.gemfile
@@ -3,5 +3,6 @@
 source "https://rubygems.org"
 
 gem "activesupport", "~> 4.1.0"
+gem "actionpack", "~> 4.1.0"
 
 gemspec :path => "../"
diff --git a/gemfiles/activesupport4.2.gemfile b/gemfiles/activesupport4.2.gemfile
index 67154bc..7e517e7 100644
--- a/gemfiles/activesupport4.2.gemfile
+++ b/gemfiles/activesupport4.2.gemfile
@@ -2,6 +2,6 @@
 
 source "https://rubygems.org"
 
-gem "activesupport", "~> 4.2.1"
+gem "actionpack", "~> 4.2.1"
 
 gemspec :path => "../"
diff --git a/lib/rack/attack.rb b/lib/rack/attack.rb
index d8308a5..1e0ae9a 100644
--- a/lib/rack/attack.rb
+++ b/lib/rack/attack.rb
@@ -3,6 +3,7 @@ require 'forwardable'
 
 class Rack::Attack
   autoload :Cache,           'rack/attack/cache'
+  autoload :PathNormalizer,  'rack/attack/path_normalizer'
   autoload :Check,           'rack/attack/check'
   autoload :Throttle,        'rack/attack/throttle'
   autoload :Whitelist,       'rack/attack/whitelist'
@@ -91,6 +92,7 @@ class Rack::Attack
   end
 
   def call(env)
+    env['PATH_INFO'] = PathNormalizer.normalize_path(env['PATH_INFO'])
     req = Rack::Attack::Request.new(env)
 
     if whitelisted?(req)
diff --git a/lib/rack/attack/path_normalizer.rb b/lib/rack/attack/path_normalizer.rb
new file mode 100644
index 0000000..afeb2f9
--- /dev/null
+++ b/lib/rack/attack/path_normalizer.rb
@@ -0,0 +1,27 @@
+class Rack::Attack
+
+  # When using Rack::Attack with a Rails app, developers expect the request path
+  # to be normalized. In particular, trailing slashes are stripped.
+  # (See http://git.io/v0rrR for implementation.)
+  #
+  # Look for an ActionDispatch utility class that Rails folks would expect
+  # to normalize request paths. If unavailable, use a fallback class that
+  # doesn't normalize the path (as a non-Rails rack app developer expects).
+
+  module FallbackPathNormalizer
+    def self.normalize_path(path)
+      path
+    end
+  end
+
+  PathNormalizer = if defined?(::ActionDispatch::Journey::Router::Utils)
+                 # For Rails 4+ apps
+                 ::ActionDispatch::Journey::Router::Utils
+               elsif defined?(::Journey::Router::Utils)
+                 # for Rails 3.2
+                 ::Journey::Router::Utils
+               else
+                 FallbackPathNormalizer
+               end
+
+end
diff --git a/rack-attack.gemspec b/rack-attack.gemspec
index bef0f45..057aa6d 100644
--- a/rack-attack.gemspec
+++ b/rack-attack.gemspec
@@ -28,6 +28,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'rake'
   s.add_development_dependency 'appraisal'
   s.add_development_dependency 'activesupport', '>= 3.0.0'
+  s.add_development_dependency 'actionpack', '>= 3.0.0'
   s.add_development_dependency 'redis-activesupport'
   s.add_development_dependency 'dalli'
   s.add_development_dependency 'connection_pool'
diff --git a/spec/rack_attack_path_normalizer_spec.rb b/spec/rack_attack_path_normalizer_spec.rb
new file mode 100644
index 0000000..1c5b66e
--- /dev/null
+++ b/spec/rack_attack_path_normalizer_spec.rb
@@ -0,0 +1,17 @@
+require_relative 'spec_helper'
+
+describe Rack::Attack::PathNormalizer do
+  subject { Rack::Attack::PathNormalizer }
+
+  it 'should have a normalize_path method' do
+    subject.normalize_path('/foo').must_equal '/foo'
+  end
+
+  describe 'FallbackNormalizer' do
+    subject { Rack::Attack::FallbackPathNormalizer }
+
+    it '#normalize_path does not change the path' do
+      subject.normalize_path('').must_equal ''
+    end
+  end
+end
diff --git a/spec/rack_attack_spec.rb b/spec/rack_attack_spec.rb
index cd6b599..3084ffb 100644
--- a/spec/rack_attack_spec.rb
+++ b/spec/rack_attack_spec.rb
@@ -3,6 +3,17 @@ require_relative 'spec_helper'
 describe 'Rack::Attack' do
   allow_ok_requests
 
+  describe 'normalizing paths' do
+    before do
+      Rack::Attack.blacklist("banned_path") {|req| req.path == '/foo' }
+    end
+
+    it 'blocks requests with trailing slash' do
+      get '/foo/'
+      last_response.status.must_equal 403
+    end
+  end
+
   describe 'blacklist' do
     before do
       @bad_ip = '1.2.3.4'
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 5382087..118d1fe 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -5,6 +5,11 @@ require "minitest/autorun"
 require "minitest/pride"
 require "rack/test"
 require 'active_support'
+require 'action_dispatch'
+
+# Load Journey for Rails 3.2
+require 'journey' if ActionPack::VERSION::MAJOR == 3
+
 require "rack/attack"
 
 begin