diff --git a/CHANGELOG.rdoc b/CHANGELOG.rdoc
index f0668232..e6084623 100644
--- a/CHANGELOG.rdoc
+++ b/CHANGELOG.rdoc
@@ -6,6 +6,7 @@
 
 * 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 05a0ef4c..8706be02 100644
--- a/lib/simple_form/action_view_extensions/builder.rb
+++ b/lib/simple_form/action_view_extensions/builder.rb
@@ -178,8 +178,11 @@ class ActionView::Helpers::FormBuilder
 
         [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/collection_input_test.rb b/test/inputs/collection_input_test.rb
index 2f24eaa5..986b2b2d 100644
--- a/test/inputs/collection_input_test.rb
+++ b/test/inputs/collection_input_test.rb
@@ -298,4 +298,13 @@ class CollectionInputTest < ActionView::TestCase
     assert_select 'select option[value=Antonio]', 'ANTONIO'
     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
 end