diff --git a/mcs/class/System.Web/System.Web.UI/Page.cs b/mcs/class/System.Web/System.Web.UI/Page.cs
index 86e17bbc1caf..e6c79483a0d5 100644
--- a/mcs/class/System.Web/System.Web.UI/Page.cs
+++ b/mcs/class/System.Web/System.Web.UI/Page.cs
@@ -1175,7 +1175,7 @@ internal void OnFormPostRender (HtmlTextWriter writer, string formUniqueID)
 
 	void ProcessPostData (NameValueCollection data, bool second)
 	{
-		NameValueCollection requestValues = _requestValueCollection == null ? new NameValueCollection () : _requestValueCollection;
+		NameValueCollection requestValues = _requestValueCollection == null ? new NameValueCollection (SecureHashCodeProvider.DefaultInvariant, CaseInsensitiveComparer.DefaultInvariant) : _requestValueCollection;
 		
 		if (data != null && data.Count > 0) {
 			var used = new Dictionary <string, string> (StringComparer.Ordinal);
@@ -1210,7 +1210,7 @@ void ProcessPostData (NameValueCollection data, bool second)
 
 				} else if (!second) {
 					if (secondPostData == null)
-						secondPostData = new NameValueCollection ();
+						secondPostData = new NameValueCollection (SecureHashCodeProvider.DefaultInvariant, CaseInsensitiveComparer.DefaultInvariant);
 					secondPostData.Add (id, data [id]);
 				}
 			}