diff --git a/src/proto/fileio.pro b/src/proto/fileio.pro
index baf6216..113b668 100644
--- a/src/proto/fileio.pro
+++ b/src/proto/fileio.pro
@@ -47,6 +47,7 @@
 int has_insertcharpre __ARGS((void));
 void block_autocmds __ARGS((void));
 void unblock_autocmds __ARGS((void));
+char_u *getnextac __ARGS((int c, void *cookie, int indent));
 int has_autocmd __ARGS((event_T event, char_u *sfname, buf_T *buf));
 char_u *get_augroup_name __ARGS((expand_T *xp, int idx));
 char_u *set_context_in_autocmd __ARGS((expand_T *xp, char_u *arg, int doautocmd));