diff --git a/AirlineServer/AirlineServer/IAirlineService.cs b/AirlineServer/AirlineServer/IAirlineService.cs
index d2c3c73..3951f8c 100644
--- a/AirlineServer/AirlineServer/IAirlineService.cs
+++ b/AirlineServer/AirlineServer/IAirlineService.cs
@@ -22,6 +22,7 @@ namespace AirlineServer
                                                     int numberOfSeats);
         [OperationContract]
         Flight BookFlight(Flight flight, int numberOfSeats);
+        [OperationContract]
         Flight CancelFlight(Flight flight, int numberOfSeats);
     }
 }