diff --git a/Pilz.Net/Api/ApiMessage.cs b/Pilz.Net/Api/ApiMessage.cs
index c33eb9f..b701faa 100644
--- a/Pilz.Net/Api/ApiMessage.cs
+++ b/Pilz.Net/Api/ApiMessage.cs
@@ -4,7 +4,7 @@ public abstract class ApiMessage
 {
     private class EmptyApiMessage : ApiMessage { }
 
-    public ApiMessage Empty { get; } = new EmptyApiMessage();
+    public static ApiMessage Empty { get; } = new EmptyApiMessage();
 
     public bool IsEmpty => this is EmptyApiMessage;
 }