diff --git a/app/src/main/kotlin/jackall/overlaymulticounter/activity/MainActivity.kt b/app/src/main/kotlin/jackall/overlaymulticounter/activity/MainActivity.kt
index 9495e86..bee88a1 100644
--- a/app/src/main/kotlin/jackall/overlaymulticounter/activity/MainActivity.kt
+++ b/app/src/main/kotlin/jackall/overlaymulticounter/activity/MainActivity.kt
@@ -21,6 +21,7 @@
         binding = DataBindingUtil.setContentView(this, R.layout.activity_main)
         mainViewModel = ViewModelProviders.of(this, MainViewModel.Factory()).get(MainViewModel::class.java)
         binding.mainViewModel = mainViewModel
+        lifecycle.addObserver(mainViewModel)
 
         if (CounterRealmHelper().getNextId() == 0) {
             CounterRealmHelper().insert(
diff --git a/app/src/main/kotlin/jackall/overlaymulticounter/viewmodel/MainViewModel.kt b/app/src/main/kotlin/jackall/overlaymulticounter/viewmodel/MainViewModel.kt
index 655f275..15d3899 100644
--- a/app/src/main/kotlin/jackall/overlaymulticounter/viewmodel/MainViewModel.kt
+++ b/app/src/main/kotlin/jackall/overlaymulticounter/viewmodel/MainViewModel.kt
@@ -30,7 +30,7 @@
 /**
  * Created by matsumoto_k on 2017/11/10.
  */
-class MainViewModel : ViewModel(), LifecycleObserver, CounterContract {
+class MainViewModel : LifecycleViewModel(), LifecycleObserver, CounterContract {
     var counterAdapter: CounterAdapter
     var counterRealmHelper = CounterRealmHelper()
     var realmChangeListener: OrderedRealmCollectionChangeListener<RealmResults<Counter>>
@@ -114,7 +114,8 @@
         counterRealmHelper.updateTitle(id, title)
     }
 
-    fun onDestory() {
+    override fun onDestroy() {
+        super.onDestroy()
         counterRealmHelper.close()
     }