diff --git a/Rx.NET/Source/src/System.Reactive/Linq/Observable/TakeWhile.cs b/Rx.NET/Source/src/System.Reactive/Linq/Observable/TakeWhile.cs
index cbb38d445e..76975019f8 100644
--- a/Rx.NET/Source/src/System.Reactive/Linq/Observable/TakeWhile.cs
+++ b/Rx.NET/Source/src/System.Reactive/Linq/Observable/TakeWhile.cs
@@ -86,7 +86,6 @@ public _(Func<TSource, int, bool> predicate, IObserver<TSource> observer)
                 {
                     _predicate = predicate;
                     _running = true;
-                    _index = 0;
                 }
 
                 public override void OnNext(TSource value)