diff --git a/db/migrate/20150930132305_move_points_category_to_categorization_tables.rb b/db/migrate/20150930132305_move_points_category_to_categorization_tables.rb
index ab642c4..67994b9 100644
--- a/db/migrate/20150930132305_move_points_category_to_categorization_tables.rb
+++ b/db/migrate/20150930132305_move_points_category_to_categorization_tables.rb
@@ -7,13 +7,13 @@ class MovePointsCategoryToCategorizationTables < ActiveRecord::Migration
       settings = Noosfero::Plugin::Settings.new(env, GamificationPlugin)
       weight = settings.settings.fetch(:point_rules, {}).fetch(name.to_s, {}).fetch('weight', setting[:default_weight]).to_i
       cat = GamificationPlugin::PointsCategorization.create(point_type_id: type.id, weight: weight)
-      Merit::Score.update_all "category = '#{cat.id}'", category: name
+      Merit::Score.where(category: name).update_all(category: cat.id.to_s)
     end
   end
 
   def down
     GamificationPlugin::PointsCategorization.all.each do |categorization|
-      Merit::Score.update_all "category = '#{categorization.point_type.name}'", category: categorization.id.to_s
+      Merit::Score.where(category: categorization.id.to_s).update_all(category: categorization.point_type.name)
       categorization.point_type.destroy
       categorization.destroy
     end
--
libgit2 0.21.2