diff --git a/app/src/main/java/keijumt/devandroid/viewmodel/AsyncViewModel.kt b/app/src/main/java/keijumt/devandroid/viewmodel/AsyncViewModel.kt
index 6edc5e9..264b83a 100644
--- a/app/src/main/java/keijumt/devandroid/viewmodel/AsyncViewModel.kt
+++ b/app/src/main/java/keijumt/devandroid/viewmodel/AsyncViewModel.kt
@@ -7,6 +7,7 @@
 import io.reactivex.rxkotlin.subscribeBy
 import io.reactivex.schedulers.Schedulers
 import keijumt.devandroid.common.Task
+import kotlinx.coroutines.experimental.android.UI
 import kotlinx.coroutines.experimental.async
 import kotlinx.coroutines.experimental.launch
 import javax.inject.Inject
@@ -23,7 +24,7 @@
     }
 
     fun coroutine() {
-        launch {
+        launch(UI) {
             val result = calc(3).await() * calc(5).await()
             println(result)
         }