diff --git a/lib/xpath/html.rb b/lib/xpath/html.rb
index 2c22fe9..e52de95 100644
--- a/lib/xpath/html.rb
+++ b/lib/xpath/html.rb
@@ -88,7 +88,7 @@ def select(locator)
     #   Label, id, or name of the checkbox to match
     #
     def checkbox(locator)
-      xpath = locate_field(descendant(:input)[attr(:type).equals('checkbox')], locator)
+      locate_field(descendant(:input)[attr(:type).equals('checkbox')], locator)
     end
 
 
diff --git a/lib/xpath/renderer.rb b/lib/xpath/renderer.rb
index 2b35cf5..71186dd 100644
--- a/lib/xpath/renderer.rb
+++ b/lib/xpath/renderer.rb
@@ -105,8 +105,8 @@ def literal(node)
     end
 
     def css(current, selector)
-      paths = Nokogiri::CSS.xpath_for(selector).map do |selector|
-        "#{current}#{selector}"
+      paths = Nokogiri::CSS.xpath_for(selector).map do |xpath_selector|
+        "#{current}#{xpath_selector}"
       end
       union(paths)
     end