diff --git a/popcorn/Assets/MyGame/Scenes/CornField/Scripts/FertilizerButtonView.cs b/popcorn/Assets/MyGame/Scenes/CornField/Scripts/FertilizerButtonView.cs
index 4258d382..d8705962 100644
--- a/popcorn/Assets/MyGame/Scenes/CornField/Scripts/FertilizerButtonView.cs
+++ b/popcorn/Assets/MyGame/Scenes/CornField/Scripts/FertilizerButtonView.cs
@@ -14,7 +14,7 @@ namespace MyGame.Scenes.CornField.Scripts
         private IDisposable timerDisposable = null;
         public IObservable<Unit> RewardButton => rewardButton.OnClickAsObservable().TakeUntilDestroy(this);
 
-        public void SetButtonActive(bool active)
+        private void SetButtonActive(bool active)
         {
             rewardButton.gameObject.SetActive(active);
             DisableObject.SetActive(!active);
@@ -40,7 +40,7 @@ namespace MyGame.Scenes.CornField.Scripts
                 }, () =>
                 {
                     SetButtonActive(true);
-                });
+                }).AddTo(this);
         }
     }
 }
\ No newline at end of file