diff --git a/csharp/Lib/Units/Units.cs b/csharp/Lib/Units/Units.cs
index 161b52a0e..50fae56a2 100644
--- a/csharp/Lib/Units/Units.cs
+++ b/csharp/Lib/Units/Units.cs
@@ -21,6 +21,7 @@ public static class Units
     public static Temperature   Celsius(this Double value) => value;
     public static Energy        KWh    (this Double value) => value * 1000;
     public static Energy        Wh     (this Double value) => value;
+    public static Percent       Percent(this Double value) => value;
     
     public static String ToCsv(this Object thing)
     {