diff --git a/app/models/concerns/nested_calculator_validation.rb b/app/models/concerns/nested_calculator_validation.rb
index e7473e7413..b6cf2abc1b 100644
--- a/app/models/concerns/nested_calculator_validation.rb
+++ b/app/models/concerns/nested_calculator_validation.rb
@@ -21,7 +21,7 @@ module NestedCalculatorValidation
   def add_custom_error_messages
     calculator.errors.messages&.each do |attribute, msgs|
       msgs.each do |msg|
-        errors.add(:base, "#{localize_calculator_attributes[attribute]}: #{msg}")
+        errors.add(:base, "#{localize_calculator_attributes[attribute]} #{msg}")
       end
     end
   end
diff --git a/spec/models/concerns/nested_calculator_validation_spec.rb b/spec/models/concerns/nested_calculator_validation_spec.rb
index 7900e26f6d..d6e9551a5b 100644
--- a/spec/models/concerns/nested_calculator_validation_spec.rb
+++ b/spec/models/concerns/nested_calculator_validation_spec.rb
@@ -4,44 +4,44 @@ require 'spec_helper'
 
 shared_examples "a parent model that has a Calculator" do |parent_name|
   context "when the associated Calculator is valid" do
-    let(:parent) do
+    let(:valid_parent) do
       build(parent_name, calculator: Calculator::FlatRate.new(preferred_amount: 10))
     end
 
     it "is valid" do
-      expect(parent).to be_valid
+      expect(valid_parent).to be_valid
     end
   end
 
   context "when the associated Calculator is invalid" do
-    let(:parent) do
+    let(:invalid_parent) do
       build(parent_name, calculator: Calculator::FlatRate.new(preferred_amount: "invalid"))
     end
 
     before do
-      parent.valid?
+      invalid_parent.valid?
     end
 
     it "is invalid" do
-      expect(parent).not_to be_valid
+      expect(invalid_parent).not_to be_valid
     end
 
     it "adds custom error messages to base" do
-      expect(parent.errors[:base]).to include(/^Amount: Invalid input/)
+      expect(invalid_parent.errors[:base]).to include(/^Amount: Invalid input/)
     end
 
     it "has the correct number of errors messages" do
-      error_messages = parent.errors.full_messages
+      error_messages = invalid_parent.errors.full_messages
       expect(error_messages.count).to eq 1
     end
 
     it "does not include the generic Calculator error message" do
-      error_messages = parent.errors.full_messages
+      error_messages = invalid_parent.errors.full_messages
       expect(error_messages).not_to include(/^Calculator is invalid$/)
     end
 
     it "does not include error message that begins with 'Calculator preferred'" do
-      error_messages = parent.errors.full_messages
+      error_messages = invalid_parent.errors.full_messages
       expect(error_messages).not_to include(/^Calculator preferred/)
     end
   end
@@ -57,9 +57,7 @@ shared_examples "a parent model that has a Calculator" do |parent_name|
     end
 
     it "adds custom error messages to base" do
-      expect(localized_parent.errors[:base]).to include(
-        /#{I18n.t('spree.localized_number.invalid_format')}/
-      )
+      expect(localized_parent.errors[:base]).to include(/Amount has an invalid format/)
     end
   end
 end