diff --git a/src/option.c b/src/option.c
index 3050dbc..a6d73d2 100644
--- a/src/option.c
+++ b/src/option.c
@@ -6652,6 +6652,8 @@
     to->wo_sms = from->wo_sms;
     to->wo_crb = from->wo_crb;
     to->wo_crb_save = from->wo_crb_save;
+    to->wo_siso = from->wo_siso;
+    to->wo_so = from->wo_so;
 #ifdef FEAT_SPELL
     to->wo_spell = from->wo_spell;
 #endif