diff --git a/sample/test/TestRange.cs b/sample/test/TestRange.cs
index 35fc8a6dd..d44a77d85 100644
--- a/sample/test/TestRange.cs
+++ b/sample/test/TestRange.cs
@@ -9,6 +9,8 @@
 using System;
 
 using Gtk;
+// disambiguate, Gtk.Range vs System.Range
+using Range=Gtk.Range;
 
 namespace WidgetViewer {