diff --git a/Rx.NET/Source/src/System.Reactive/Linq/Observable/ElementAt.cs b/Rx.NET/Source/src/System.Reactive/Linq/Observable/ElementAt.cs
index 6efe60d4a5..f41ede707a 100644
--- a/Rx.NET/Source/src/System.Reactive/Linq/Observable/ElementAt.cs
+++ b/Rx.NET/Source/src/System.Reactive/Linq/Observable/ElementAt.cs
@@ -42,7 +42,10 @@ public override void OnNext(TSource value)
 
             public override void OnCompleted()
             {
-                ForwardOnError(new ArgumentOutOfRangeException("index"));
+                if (_i >= 0)
+                {
+                    ForwardOnError(new ArgumentOutOfRangeException("index"));
+                }
             }
         }
     }