#define IS_MOUSEKEY_BUTTON(code) (KB_MS_BTN1 <= (code) && (code) <= KB_MS_BTN5)
#define IS_MOUSEKEY_WHEEL(code) (KB_MS_WH_UP <= (code) && (code) <= KB_MS_WH_RIGHT)
-#define MOD_BIT(code) (1<<((code) & 0x07))
-#define FN_BIT(code) (1<<((code) - KB_FN0))
+#define MOD_BIT(code) (1<<((code) & 0x07))
+#define FN_BIT(code) (1<<((code) - KB_FN0))
+#define FN_INDEX(code) ((code) - KB_FN0)
/* Short names */