diff --git a/CHANGELOG.md b/CHANGELOG.md
index 696afc150..5fe0f8944 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 - Updated user's manual for v5
 - Fix a bug: unable to process stripe payments with 3DS authentication
+- Fix a bug: unable to book an event
 
 ## v5.0.2 2021 June 11
 
diff --git a/app/frontend/src/javascript/controllers/events.js.erb b/app/frontend/src/javascript/controllers/events.js.erb
index 3f9d0a54d..d25b27740 100644
--- a/app/frontend/src/javascript/controllers/events.js.erb
+++ b/app/frontend/src/javascript/controllers/events.js.erb
@@ -633,7 +633,7 @@ Application.Controllers.controller('ShowEventController', ['$scope', '$state', '
      * Create a hash map implementing the Reservation specs
      * @param reserve {Object} Reservation parameters (places...)
      * @param event {Object} Current event
-     * @return {{reservable_id:number, reservable_type:string, slots_attributes:Array<Object>, nb_reserve_places:number}}
+     * @return {{reservation: {reservable_id:number, reservable_type:string, slots_attributes:Array<Object>, nb_reserve_places:number}}}
      */
     const mkReservation = function (reserve, event) {
       const reservation = {
@@ -661,7 +661,7 @@ Application.Controllers.controller('ShowEventController', ['$scope', '$state', '
         }
       }
 
-      return reservation;
+      return { reservation };
     };
 
     /**