diff --git a/spec/controllers/checkout_controller_concurrency_spec.rb b/spec/controllers/checkout_controller_concurrency_spec.rb
index 6a5fcd8bad..51eefe98ae 100644
--- a/spec/controllers/checkout_controller_concurrency_spec.rb
+++ b/spec/controllers/checkout_controller_concurrency_spec.rb
@@ -30,8 +30,11 @@ describe CheckoutController, concurrency: true, type: :controller do
     # New threads start running straight away. The breakpoint is after loading
     # the order and before advancing the order's state and making payments.
     breakpoint.lock
-    allow(controller).to receive(:check_order_for_phantom_fees) do
+    expect(controller).to receive(:fire_event).with("spree.checkout.update") do
       breakpoint.synchronize {}
+      # This is what fire_event does.
+      # I did not find out how to call the original code otherwise.
+      ActiveSupport::Notifications.instrument("spree.checkout.update")
     end
   end