diff --git a/config/environments/test.rb b/config/environments/test.rb
index e241e5c4ce..2e14aea9c3 100644
--- a/config/environments/test.rb
+++ b/config/environments/test.rb
@@ -58,7 +58,6 @@ Openfoodnetwork::Application.configure do
   ActiveSupport::Deprecation.behavior = ->(message, callstack, deprecation_horizon, gem_name) do
     allowed_warnings = [
       # List strings here to allow matching deprecations.
-      "Enumerable.sum", # spec/lib/reports/bulk_coop_report_spec.rb:188
     ]
     unless allowed_warnings.any? { |pattern| message.match(pattern) }
       ActiveSupport::Deprecation::DEFAULT_BEHAVIORS[:raise].call(message, callstack, deprecation_horizon, gem_name)
diff --git a/lib/reporting/reports/bulk_coop/customer_payments.rb b/lib/reporting/reports/bulk_coop/customer_payments.rb
index 97752b3feb..4e4da4ce12 100644
--- a/lib/reporting/reports/bulk_coop/customer_payments.rb
+++ b/lib/reporting/reports/bulk_coop/customer_payments.rb
@@ -21,15 +21,15 @@ module Reporting
         private
 
         def customer_payments_total_cost(line_items)
-          unique_orders(line_items).sum(&:total)
+          unique_orders(line_items).map(&:total).sum(&:to_f)
         end
 
         def customer_payments_amount_owed(line_items)
-          unique_orders(line_items).sum(&:new_outstanding_balance)
+          unique_orders(line_items).map(&:new_outstanding_balance).sum(&:to_f)
         end
 
         def customer_payments_amount_paid(line_items)
-          unique_orders(line_items).sum(&:payment_total)
+          unique_orders(line_items).map(&:payment_total).sum(&:to_f)
         end
 
         def unique_orders(line_items)