diff --git a/app/assets/javascripts/controllers/admin/pricing.coffee.erb b/app/assets/javascripts/controllers/admin/pricing.coffee.erb
index 5bc1a82ec..b5c8961d4 100644
--- a/app/assets/javascripts/controllers/admin/pricing.coffee.erb
+++ b/app/assets/javascripts/controllers/admin/pricing.coffee.erb
@@ -350,7 +350,10 @@ Application.Controllers.controller "EditPricingController", ["$scope", "$state",
 
         , (error) ->
           console.error('[EditPricingController::deleteCoupon] Error: '+error.statusText) if error.statusText
-          growl.error(_t('unable_to_delete_the_specified_coupon_an_error_occurred'))
+          if error.status == 422
+            growl.error(_t('unable_to_delete_the_specified_coupon_already_in_use'))
+          else
+            growl.error(_t('unable_to_delete_the_specified_coupon_an_unexpected_error_occurred'))
 
 
 
diff --git a/app/controllers/api/coupons_controller.rb b/app/controllers/api/coupons_controller.rb
index 728410814..430b7bc7f 100644
--- a/app/controllers/api/coupons_controller.rb
+++ b/app/controllers/api/coupons_controller.rb
@@ -30,8 +30,11 @@ class API::CouponsController < API::ApiController
 
   def destroy
     authorize Coupon
-    @coupon.destroy
-    head :no_content
+    if @coupon.safe_destroy
+      head :no_content
+    else
+      head :unprocessable_entity
+    end
   end
 
   private
diff --git a/app/models/coupon.rb b/app/models/coupon.rb
index cafb5d778..7705a4d26 100644
--- a/app/models/coupon.rb
+++ b/app/models/coupon.rb
@@ -7,4 +7,12 @@ class Coupon < ActiveRecord::Base
   validates :percent_off, presence: true
   validates :percent_off, :inclusion => 0..100
 
+  def safe_destroy
+    if self.invoices.size == 0
+      destroy
+    else
+      false
+    end
+  end
+
 end
diff --git a/config/locales/app.admin.en.yml b/config/locales/app.admin.en.yml
index 079392f89..0fdaafbdd 100644
--- a/config/locales/app.admin.en.yml
+++ b/config/locales/app.admin.en.yml
@@ -155,7 +155,8 @@ en:
         active: "Active"
         do_you_really_want_to_delete_this_coupon: "Do you really want to delete this coupon?"
         coupon_was_successfully_deleted: "Coupon was successfully deleted."
-        unable_to_delete_the_specified_coupon_an_error_occurred: "Unable to delete the specified coupon, an error occurred."
+        unable_to_delete_the_specified_coupon_already_in_use: "Unable to delete the specified coupon: it is already used with some invoices."
+        unable_to_delete_the_specified_coupon_an_unexpected_error_occurred: "Unable to delete the specified coupon: an unexpected error occurred."
 
       coupons_new:
         # ajouter un code promotionnel
diff --git a/config/locales/app.admin.fr.yml b/config/locales/app.admin.fr.yml
index b80423eeb..14b5cc7a3 100644
--- a/config/locales/app.admin.fr.yml
+++ b/config/locales/app.admin.fr.yml
@@ -155,7 +155,8 @@ fr:
         active: "Actif"
         do_you_really_want_to_delete_this_coupon: "Êtes-vous sûr(e) de vouloir supprimer ce code promotionnel ?"
         coupon_was_successfully_deleted: "Le code promotionnel a bien été supprimé."
-        unable_to_delete_the_specified_coupon_an_error_occurred: "Impossible de supprimer le code promotionnel, une erreur s'est produite."
+        unable_to_delete_the_specified_coupon_already_in_use: "Impossible de supprimer le code promotionnel : il est utilisé dans des factures."
+        unable_to_delete_the_specified_coupon_an_unexpected_error_occurred: "Impossible de supprimer le code promotionnel : une erreur inattendue s'est produite."
 
       coupons_new:
         # ajouter un code promotionnel