diff --git a/CHANGELOG.md b/CHANGELOG.md
index f0242576e..a011bc328 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@
 - Fix a bug: unable to book a free event
 - Fix a bug: can't see the dates for the next booked training session, when the user is reserving a machine without the appropriate training
 - Fix a bug: invalid link to the user's manual
+- Fix a bug: unable to sync coupons on stripe
 
 ## v5.0.4 2021 June 15
 
diff --git a/app/workers/sync_objects_on_stripe_worker.rb b/app/workers/sync_objects_on_stripe_worker.rb
index 4add9fbef..859c7285d 100644
--- a/app/workers/sync_objects_on_stripe_worker.rb
+++ b/app/workers/sync_objects_on_stripe_worker.rb
@@ -26,9 +26,9 @@ class SyncObjectsOnStripeWorker
     total = Coupon.all.count
     Coupon.all.each_with_index do |coupon, index|
       logger.debug "#{index} / #{total}"
-      Stripe::Coupon.retrieve(c.code, api_key: Setting.get('stripe_secret_key'))
+      Stripe::Coupon.retrieve(coupon.code, api_key: Setting.get('stripe_secret_key'))
     rescue Stripe::InvalidRequestError
-      Stripe::Service.create_coupon(c.id)
+      Stripe::Service.create_coupon(coupon.id)
     end
 
     w = StripeWorker.new