gistfile1.txt

diff --git a/mcs/class/System.Core/System.Linq/Enumerable.cs b/mcs/class/System.Core/System.Linq/Enumerable.cs
index b128543..bc4d8db 100644
--- a/mcs/class/System.Core/System.Linq/Enumerable.cs
+++ b/mcs/class/System.Core/System.Linq/Enumerable.cs
@@ -2834,6 +2834,9 @@ namespace System.Linq
 			Func<TSource, TKey> keySelector, IComparer<TKey> comparer)
 		{
 			Check.SourceAndKeySelector (source, keySelector);
+			var oe = source as OrderedEnumerable <TSource>;
+			if (oe != null)
+				return oe.CreateOrderedEnumerable (keySelector, comparer, false);
 
 			return source.CreateOrderedEnumerable (keySelector, comparer, false);
 		}
@@ -2853,6 +2856,10 @@ namespace System.Linq
 		{
 			Check.SourceAndKeySelector (source, keySelector);
 
+			var oe = source as OrderedEnumerable <TSource>;
+			if (oe != null)
+				return oe.CreateOrderedEnumerable (keySelector, comparer, true);
+
 			return source.CreateOrderedEnumerable (keySelector, comparer, true);
 		}