diff --git a/Assets/UniRx.Async/UniTaskObservableExtensions.cs b/Assets/UniRx.Async/UniTaskObservableExtensions.cs
index a089093..2c5dd49 100644
--- a/Assets/UniRx.Async/UniTaskObservableExtensions.cs
+++ b/Assets/UniRx.Async/UniTaskObservableExtensions.cs
@@ -257,6 +257,7 @@ namespace UniRx.Async
             public IDisposable Subscribe(IObserver<T> observer)
             {
                 observer.OnNext(value);
+                observer.OnCompleted();
                 return EmptyDisposable.Instance;
             }
         }