diff --git a/Terminal.Gui/Drivers/WindowsDriver.cs b/Terminal.Gui/Drivers/WindowsDriver.cs
index ca1b107fb..fc28abb49 100644
--- a/Terminal.Gui/Drivers/WindowsDriver.cs
+++ b/Terminal.Gui/Drivers/WindowsDriver.cs
@@ -221,7 +221,7 @@ namespace Terminal.Gui {
 			public uint bSetFocus;
 		}
 
-		public enum EventType {
+		public enum EventType : ushort {
 			Focus = 0x10,
 			Key = 0x1,
 			Menu = 0x8,