diff --git a/app/models/chargeback_rate_detail.rb b/app/models/chargeback_rate_detail.rb
index 12f976779ce3..36a4b82e98e0 100644
--- a/app/models/chargeback_rate_detail.rb
+++ b/app/models/chargeback_rate_detail.rb
@@ -25,7 +25,7 @@ class ChargebackRateDetail < ApplicationRecord
 
   def charge(relevant_fields, consumption)
     result = {}
-    if (relevant_fields & [metric_key, cost_keys[0]]).present?
+    if (relevant_fields & ([metric_key] + cost_keys)).present?
       metric_value, cost = metric_and_cost_by(consumption)
       if !consumption.chargeback_fields_present && chargeable_field.fixed?
         cost = 0
diff --git a/spec/models/chargeback_vm_spec.rb b/spec/models/chargeback_vm_spec.rb
index 3dd883ef6add..ea5ffb1fbcc1 100644
--- a/spec/models/chargeback_vm_spec.rb
+++ b/spec/models/chargeback_vm_spec.rb
@@ -188,6 +188,17 @@
         expect(subject.storage_cost).to eq(subject.storage_allocated_cost + subject.storage_used_cost)
       end
 
+      context "only memory_cost instead of all report columns" do
+        let(:options) { base_options.merge(:interval => 'daily', :report_cols => %w(memory_cost)) }
+
+        it "brings in relevant fields needed for calculation" do
+          memory_allocated_cost = memory_available * hourly_rate * hours_in_day
+          used_metric = used_average_for(:derived_memory_used, hours_in_day, @vm1)
+          memory_used_cost = used_metric * hourly_rate * hours_in_day
+          expect(subject.memory_cost).to eq(memory_allocated_cost + memory_used_cost)
+        end
+      end
+
       context "fixed rates" do
         let(:hourly_fixed_rate) { 10.0 }