diff --git a/src/proto/option.pro b/src/proto/option.pro
index 1659131..db92bf2 100644
--- a/src/proto/option.pro
+++ b/src/proto/option.pro
@@ -71,6 +71,7 @@
 char *did_set_swapfile(optset_T *args);
 char *did_set_tabclose(optset_T *args);
 char *did_set_termguicolors(optset_T *args);
+char *did_set_termwinscroll(optset_T *args);
 char *did_set_terse(optset_T *args);
 char *did_set_textauto(optset_T *args);
 char *did_set_textmode(optset_T *args);