diff --git a/src/option.c b/src/option.c
index 1ba08f7..d9cfda0 100644
--- a/src/option.c
+++ b/src/option.c
@@ -2978,6 +2978,7 @@
     p_term("t_WS", T_CWS)
     p_term("t_SI", T_CSI)
     p_term("t_EI", T_CEI)
+    p_term("t_xn", T_XN)
     p_term("t_xs", T_XS)
     p_term("t_ZH", T_CZH)
     p_term("t_ZR", T_CZR)