diff --git a/dotnet/src/dotnetframework/GxClasses/Domain/GxCollections.cs b/dotnet/src/dotnetframework/GxClasses/Domain/GxCollections.cs
index 27f2f95fa..6c9208658 100644
--- a/dotnet/src/dotnetframework/GxClasses/Domain/GxCollections.cs
+++ b/dotnet/src/dotnetframework/GxClasses/Domain/GxCollections.cs
@@ -19,6 +19,7 @@ namespace GeneXus.Utils
 	using System.Runtime.Serialization;
 	using System.Runtime.Serialization.Json;
 	using System.Text;
+	using System.Text.Json.Serialization;
 	using System.Xml;
 	using System.Xml.Serialization;
 	using GeneXus.Application;