diff --git a/ProjectCatamaran/ProjectCatamaran/MovementStrategy/MoveableBoat.cs b/ProjectCatamaran/ProjectCatamaran/MovementStrategy/MoveableBoat.cs
index b7b8f69..bf63e73 100644
--- a/ProjectCatamaran/ProjectCatamaran/MovementStrategy/MoveableBoat.cs
+++ b/ProjectCatamaran/ProjectCatamaran/MovementStrategy/MoveableBoat.cs
@@ -12,7 +12,7 @@ namespace ProjectCatamaran.MovementStrategy
         /// <summary>
         /// Поле-объект класса DrawningBoat или его наследника
         /// </summary>
-        private DrawningBoat _boat = null;
+        private readonly DrawningBoat? _boat = null;
         /// <summary>
         /// Конструктор
         /// </summary>