diff --git a/src/proto/fileio.pro b/src/proto/fileio.pro
index d65ec7c..baf6216 100644
--- a/src/proto/fileio.pro
+++ b/src/proto/fileio.pro
@@ -44,6 +44,7 @@
 int trigger_cursorhold __ARGS((void));
 int has_cursormoved __ARGS((void));
 int has_cursormovedI __ARGS((void));
+int has_insertcharpre __ARGS((void));
 void block_autocmds __ARGS((void));
 void unblock_autocmds __ARGS((void));
 int has_autocmd __ARGS((event_T event, char_u *sfname, buf_T *buf));