diff --git a/csharp/ql/test/query-tests/Security Features/CWE-611/stubs.cs b/csharp/ql/test/query-tests/Security Features/CWE-611/stubs.cs
index 04c39623cac..6375ac035c1 100644
--- a/csharp/ql/test/query-tests/Security Features/CWE-611/stubs.cs	
+++ b/csharp/ql/test/query-tests/Security Features/CWE-611/stubs.cs	
@@ -1,3 +1,9 @@
-namespace System.Web;
+namespace System
+{
+    public class Uri { }
 
-public interface IHtmlString { }
+    namespace Web
+    {
+        public interface IHtmlString { }
+    }
+}