diff --git a/spec/models/calculator/flexi_rate_spec.rb b/spec/models/calculator/flexi_rate_spec.rb
index 9192aecdb5..8890a1847d 100644
--- a/spec/models/calculator/flexi_rate_spec.rb
+++ b/spec/models/calculator/flexi_rate_spec.rb
@@ -1,7 +1,7 @@
 require 'spec_helper'
 
 describe Calculator::FlexiRate do
-  let(:line_item) { build(:line_item, quantity: quantity) }
+  let(:line_item) { build_stubbed(:line_item, quantity: quantity) }
   let(:calculator) do
     Calculator::FlexiRate.new(
       preferred_first_item: 2,
diff --git a/spec/models/calculator/per_item_spec.rb b/spec/models/calculator/per_item_spec.rb
index 7ce41251f4..279447edae 100644
--- a/spec/models/calculator/per_item_spec.rb
+++ b/spec/models/calculator/per_item_spec.rb
@@ -3,7 +3,7 @@ require 'spec_helper'
 describe Calculator::PerItem do
   let(:calculator) { Calculator::PerItem.new(preferred_amount: 10) }
   let(:shipping_calculable) { double(:calculable) }
-  let(:line_item) { build(:line_item, quantity: 5) }
+  let(:line_item) { build_stubbed(:line_item, quantity: 5) }
 
   it "correctly calculates on a single line item object" do
     allow(calculator).to receive_messages(calculable: shipping_calculable)