diff --git a/OSCCollar/OSCCollar.cs b/OSCCollar/OSCCollar.cs
index 94a0780..9f9a6a0 100644
--- a/OSCCollar/OSCCollar.cs
+++ b/OSCCollar/OSCCollar.cs
@@ -30,7 +30,7 @@ public partial class OSCCollar
         }
     }
 
-    private Config _config;
+    private readonly Config _config;
     private readonly int _portReceive;
 
     private OSCQueryService? OscQueryService { get; set; }