diff --git a/include/ntcon/ntcon.h b/include/ntcon/ntcon.h
index cef11cf..98f4370 100644
--- a/include/ntcon/ntcon.h
+++ b/include/ntcon/ntcon.h
@@ -120,6 +120,7 @@ extern "C" {
 #define NT_ENABLE_MOUSE_INPUT		(0x0010)
 #define NT_ENABLE_INSERT_MODE		(0x0020)
 #define NT_ENABLE_QUICK_EDIT_MODE	(0x0040)
+#define NT_ENABLE_EXTENDED_FLAGS	(0x0080)
 
 /* console display modes */
 #define NT_CONSOLE_FULLSCREEN		(0x0001)