diff --git a/app/models/labor_budget_item.rb b/app/models/labor_budget_item.rb
index 1aee14fb85..dcc3921ea9 100644
--- a/app/models/labor_budget_item.rb
+++ b/app/models/labor_budget_item.rb
@@ -42,6 +42,7 @@ class LaborBudgetItem < ActiveRecord::Base
   scope :visible_costs, lambda{|*args|
     includes([{ cost_object: :project }, :user])
       .where(LaborBudgetItem.visible_condition((args.first || User.current), args[1]))
+      .references(:projects)
   }
 
   def costs
diff --git a/app/models/material_budget_item.rb b/app/models/material_budget_item.rb
index b3eeaf452f..d29c4cb5ad 100644
--- a/app/models/material_budget_item.rb
+++ b/app/models/material_budget_item.rb
@@ -35,6 +35,7 @@ class MaterialBudgetItem < ActiveRecord::Base
   scope :visible_costs, lambda { |*args|
     where(MaterialBudgetItem.visible_condition((args.first || User.current), args[1]))
       .includes(cost_object: :project)
+      .references(:projects)
   }
 
   def costs