diff --git a/CHANGELOG.rdoc b/CHANGELOG.rdoc
index c37b43699..d8190d926 100644
--- a/CHANGELOG.rdoc
+++ b/CHANGELOG.rdoc
@@ -5,6 +5,7 @@
 
 * bug fix
   * Fallback to default label when block is provided (github.com/pivotal-casebook)
+  * Do not override default selection through attribute value in collection select when label/value methods are lambdas
 
 == 1.5.0
 
diff --git a/lib/simple_form/action_view_extensions/builder.rb b/lib/simple_form/action_view_extensions/builder.rb
index 05a0ef4c3..8706be024 100644
--- a/lib/simple_form/action_view_extensions/builder.rb
+++ b/lib/simple_form/action_view_extensions/builder.rb
@@ -178,8 +178,11 @@ def collection_select(attribute, collection, value_method, text_method, options=
 
         [value, text, selected, disabled]
       end
-      options[:disabled] = collection.map(&:pop).compact
-      options[:selected] = collection.map(&:pop).compact
+
+      [:disabled, :selected].each do |option|
+        option_value    = collection.map(&:pop).compact
+        options[option] = option_value if option_value.present?
+      end
       value_method, text_method = :first, :last
     end
 
diff --git a/test/inputs_test.rb b/test/inputs_test.rb
index 34d54199f..d06e46bc0 100644
--- a/test/inputs_test.rb
+++ b/test/inputs_test.rb
@@ -847,6 +847,15 @@ def with_input_for(object, attribute_name, type, options={})
     assert_no_select 'select option[value=Antonio][selected]'
   end
 
+  test 'input should not override default selection through attribute value with label method as lambda for collection select' do
+    @user.name = "Carlos"
+    with_input_for @user, :name, :select, :collection => ["Carlos", "Antonio"],
+      :label_method => lambda { |x| x.upcase }
+    assert_select 'select option[value=Carlos][selected=selected]', 'CARLOS'
+    assert_select 'select option[value=Antonio]', 'ANTONIO'
+    assert_no_select 'select option[value=Antonio][selected]'
+  end
+
   test 'input should allow overriding collection for radio types' do
     with_input_for @user, :name, :radio, :collection => ['Jose', 'Carlos']
     assert_select 'input[type=radio][value=Jose]'