diff --git a/railties/CHANGELOG.md b/railties/CHANGELOG.md
index 967f850ea0..85e71b6c5c 100644
--- a/railties/CHANGELOG.md
+++ b/railties/CHANGELOG.md
@@ -1,3 +1,7 @@
+*   Route generator should be idempotent
+    running generators several times no longer require you to cleanup routes.rb
+
+    *Thiago Pinto*
 *   Allow passing an environment to `config_for`.
 
     *Simon Eskildsen*
diff --git a/railties/lib/rails/generators/actions.rb b/railties/lib/rails/generators/actions.rb
index b4356f71e0..5bbd2f1aed 100644
--- a/railties/lib/rails/generators/actions.rb
+++ b/railties/lib/rails/generators/actions.rb
@@ -235,7 +235,7 @@ module Rails
         sentinel = /\.routes\.draw do\s*\n/m
 
         in_root do
-          inject_into_file 'config/routes.rb', "  #{routing_code}\n", { after: sentinel, verbose: false, force: true }
+          inject_into_file 'config/routes.rb', "  #{routing_code}\n", { after: sentinel, verbose: false, force: false }
         end
       end
 
diff --git a/railties/test/generators/actions_test.rb b/railties/test/generators/actions_test.rb
index fabba555ef..b4fbea4af4 100644
--- a/railties/test/generators/actions_test.rb
+++ b/railties/test/generators/actions_test.rb
@@ -235,6 +235,21 @@ class ActionsTest < Rails::Generators::TestCase
     assert_file 'config/routes.rb', /#{Regexp.escape(route_command)}/
   end
 
+  def test_route_should_be_idempotent
+    run_generator
+    route_path = File.expand_path('config/routes.rb', destination_root)
+
+    # runs first time, not asserting
+    action :route, "root 'welcome#index'"
+    content_1 = File.read(route_path)
+
+    # runs second time
+    action :route, "root 'welcome#index'"
+    content_2 = File.read(route_path)
+
+    assert_equal content_1, content_2
+  end
+
   def test_route_should_add_data_with_an_new_line
     run_generator
     action :route, "root 'welcome#index'"