diff --git a/lib/pairwise/question.rb b/lib/pairwise/question.rb
index 972ca8e..5f9a5bf 100644
--- a/lib/pairwise/question.rb
+++ b/lib/pairwise/question.rb
@@ -5,13 +5,11 @@ class Pairwise::Question < ActiveResource::Base
   self.format = :xml
 
   def get_choices(filter=nil, order=nil)
-    Pairwise::Choice.find(
-      :all,
-      :params => {
-        :question_id => self.id,
-        :filter => filter,
-        :order => order
-      })
+    params = {}
+    params[:question_id] = self.id
+    params[:order] = order
+    params[:filter] = filter unless filter.nil?
+    Pairwise::Choice.find(:all, :params => params)
   end
 
   def choices_include_inactive
diff --git a/lib/pairwise_plugin.rb b/lib/pairwise_plugin.rb
index 5d53205..41eb344 100644
--- a/lib/pairwise_plugin.rb
+++ b/lib/pairwise_plugin.rb
@@ -1,3 +1,4 @@
+require 'active_resource'
 class PairwisePlugin < Noosfero::Plugin
 
   def self.plugin_name
--
libgit2 0.21.2