diff --git a/src/proto/buffer.pro b/src/proto/buffer.pro
index 3fdcc69..82bcaf3 100644
--- a/src/proto/buffer.pro
+++ b/src/proto/buffer.pro
@@ -66,6 +66,7 @@
 int bt_dontwrite_msg(buf_T *buf);
 int buf_hide(buf_T *buf);
 char_u *buf_spname(buf_T *buf);
+char_u *buf_get_fname(buf_T *buf);
 void set_buflisted(int on);
 int buf_contents_changed(buf_T *buf);
 void wipe_buffer(buf_T *buf, int aucmd);