diff --git a/Assets/Tests/AsyncTest.cs b/Assets/Tests/AsyncTest.cs
index ac50945..d0931bc 100644
--- a/Assets/Tests/AsyncTest.cs
+++ b/Assets/Tests/AsyncTest.cs
@@ -376,6 +376,27 @@ namespace UniRx.AsyncTests
             throw new Exception("MyException");
         }
 
+        [UnityTest]
+        public IEnumerator NestedEnumerator() => UniTask.ToCoroutine(async () =>
+        {
+            var time = Time.realtimeSinceStartup;
+
+            await ParentCoroutineEnumerator();
+
+            var elapsed = Time.realtimeSinceStartup - time;
+            ((int)Math.Round(TimeSpan.FromSeconds(elapsed).TotalSeconds, MidpointRounding.ToEven)).Should().Be(3);
+        });
+
+        IEnumerator ParentCoroutineEnumerator()
+        {
+            yield return ChildCoroutineEnumerator();
+        }
+
+        IEnumerator ChildCoroutineEnumerator()
+        {
+            yield return new WaitForSeconds(3);
+        }
+
 #endif
 #endif
     }
diff --git a/Assets/UniRx.Async/EnumeratorAsyncExtensions.cs b/Assets/UniRx.Async/EnumeratorAsyncExtensions.cs
index 2d3114a..62b968e 100644
--- a/Assets/UniRx.Async/EnumeratorAsyncExtensions.cs
+++ b/Assets/UniRx.Async/EnumeratorAsyncExtensions.cs
@@ -191,7 +191,8 @@ namespace UniRx.Async
                     }
                     else if (current is IEnumerator e3)
                     {
-                        while (e3.MoveNext())
+                        var e4 = ConsumeEnumerator(e3);
+                        while (e4.MoveNext())
                         {
                             yield return null;
                         }