diff --git a/Lib.Driver/Xml/XmlDriver.cs b/Lib.Driver/Xml/XmlDriver.cs
index 4408e87..ea5fed8 100644
--- a/Lib.Driver/Xml/XmlDriver.cs
+++ b/Lib.Driver/Xml/XmlDriver.cs
@@ -4,14 +4,15 @@
 
 using System.Collections.Generic;
 using System.Xml.Serialization;
+using Lib.Driver.Interfaces;
 
 namespace Lib.Driver.Xml
 {
     [XmlRoot("MidiDevice")]
-    public class XmlDriver
+    public class XmlDriver : IDriver
     {
         [XmlArray("Channels")]
         [XmlArrayItem("Channel", typeof(XmlChannel))]
-        public List<XmlChannel> Channels { get; set; }
+        public List<XmlChannel>? Channels { get; set; }
     }
 }
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