diff --git a/.travis.yml b/.travis.yml
index cfbd07b5..35ee55bc 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,10 +11,6 @@ gemfile:
   - gemfiles/Gemfile.rails-4-0-stable
   - gemfiles/Gemfile.rails-4-1-stable
   - Gemfile
-matrix:
-  allow_failures:
-    - gemfile: Gemfile
-    - gemfile: gemfiles/Gemfile.rails-4-1-stable
 notifications:
   email: false
   campfire:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0e959e5c..1158585c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@
   * Add `include_default_input_wrapper_class` config [@luizcosta](https://github.com/luizcosta)
   * Map `datetime`, `date` and `time` input types to their respective HTML5 input tags
   when the `:html5` is set to `true` [@volmer](https://github.com/volmer)
+  * Add `boolean_label_class` config.
   * Add `:html` option to include additional attributes on custom wrappers [remofritzsche](https://github.com/remofritzsche) and [@ulissesalmeida](https://github.com/ulissesalmeida)
 
 ### bug fix
diff --git a/lib/generators/simple_form/templates/config/initializers/simple_form.rb b/lib/generators/simple_form/templates/config/initializers/simple_form.rb
index 328bea0c..8265128f 100644
--- a/lib/generators/simple_form/templates/config/initializers/simple_form.rb
+++ b/lib/generators/simple_form/templates/config/initializers/simple_form.rb
@@ -143,6 +143,9 @@ SimpleForm.setup do |config|
   # Default class for inputs
   # config.input_class = nil
 
+  # Define the default class of the input wrapper of the boolean input.
+  config.boolean_label_class = 'checkbox'
+
   # Defines if the default input wrapper class should be included in radio
   # collection wrappers.
   # config.include_default_input_wrapper_class = true
diff --git a/lib/simple_form.rb b/lib/simple_form.rb
index 4f977dea..a241bf27 100644
--- a/lib/simple_form.rb
+++ b/lib/simple_form.rb
@@ -157,6 +157,10 @@ module SimpleForm
   mattr_accessor :include_default_input_wrapper_class
   @@include_default_input_wrapper_class = true
 
+  # Define the default class of the input wrapper of the boolean input.
+  mattr_accessor :boolean_label_class
+  @@boolean_label_class = 'checkbox'
+
   ## WRAPPER CONFIGURATION
   # The default wrapper to be used by the FormBuilder.
   mattr_accessor :default_wrapper
diff --git a/lib/simple_form/inputs/boolean_input.rb b/lib/simple_form/inputs/boolean_input.rb
index 0ea52f19..b649685b 100644
--- a/lib/simple_form/inputs/boolean_input.rb
+++ b/lib/simple_form/inputs/boolean_input.rb
@@ -4,7 +4,7 @@ module SimpleForm
       def input
         if nested_boolean_style?
           build_hidden_field_for_checkbox +
-            template.label_tag(nil, class: "checkbox") {
+            template.label_tag(nil, class: SimpleForm.boolean_label_class) {
               build_check_box_without_hidden_field + inline_label
             }
         else
@@ -18,7 +18,7 @@ module SimpleForm
         elsif nested_boolean_style?
           html_options = label_html_options.dup
           html_options[:class] ||= []
-          html_options[:class].push(:checkbox)
+          html_options[:class].push(SimpleForm.boolean_label_class) if SimpleForm.boolean_label_class
 
           build_hidden_field_for_checkbox +
             @builder.label(label_target, html_options) {
diff --git a/test/inputs/boolean_input_test.rb b/test/inputs/boolean_input_test.rb
index ae9dcd6d..e10a1b3b 100644
--- a/test/inputs/boolean_input_test.rb
+++ b/test/inputs/boolean_input_test.rb
@@ -128,6 +128,16 @@ class BooleanInputTest < ActionView::TestCase
     end
   end
 
+  test 'input boolean with nested style works using :input only in wrapper config (no label_input), adding the extra label wrapper with custom class' do
+    swap_wrapper do
+      swap SimpleForm, boolean_style: :nested, boolean_label_class: 'foo' do
+        with_input_for @user, :active, :boolean
+
+        assert_select 'label.boolean + input[type=hidden] + label.foo > input.boolean'
+      end
+    end
+  end
+
   test 'input boolean with nested style works using :label_input in wrapper config, adding "checkbox" class to label' do
     swap_wrapper :default, self.custom_wrapper_without_top_level do
       swap SimpleForm, boolean_style: :nested do
@@ -138,6 +148,16 @@ class BooleanInputTest < ActionView::TestCase
     end
   end
 
+  test 'input boolean with nested style works using :label_input in wrapper config, adding custom class to label' do
+    swap_wrapper :default, self.custom_wrapper_without_top_level do
+      swap SimpleForm, boolean_style: :nested, boolean_label_class: 'foo' do
+        with_input_for @user, :active, :boolean
+
+        assert_select 'input[type=hidden] + label.boolean.foo > input.boolean'
+      end
+    end
+  end
+
   test 'input boolean without additional classes should add "checkbox" class to label' do
     swap_wrapper :default, self.custom_wrapper_without_top_level do
       swap SimpleForm, boolean_style: :nested, generate_additional_classes_for: [:input] do