diff --git a/src/ltui/program.lua b/src/ltui/program.lua
index f8179f2..5bc977f 100644
--- a/src/ltui/program.lua
+++ b/src/ltui/program.lua
@@ -345,6 +345,15 @@ function program:_key_map()
             [curses.KEY_SHOME       ] = "ShiftHome",
             [curses.KEY_SLEFT       ] = "ShiftLeft",
             [curses.KEY_SRIGHT      ] = "ShiftRight",
+            
+            -- register virtual keys
+            --
+            -- @see https://github.com/xmake-io/xmake/issues/1610
+            -- https://github.com/wmcbrine/PDCurses/blob/HEAD/curses.h#L766-L774
+            [curses.KEY_C2 or -1    ] = "Down",
+            [curses.KEY_A2 or -1    ] = "Up",
+            [curses.KEY_B1 or -1    ] = "Left",
+            [curses.KEY_B3 or -1    ] = "Right"
         }
     end
     return self._KEYMAP