diff --git a/src/proto/ex_cmds.pro b/src/proto/ex_cmds.pro
index 1669d79..a94f5d0 100644
--- a/src/proto/ex_cmds.pro
+++ b/src/proto/ex_cmds.pro
@@ -19,6 +19,7 @@
 void do_fixdel __ARGS((exarg_T *eap));
 void print_line_no_prefix __ARGS((linenr_T lnum, int use_number, int list));
 void print_line __ARGS((linenr_T lnum, int use_number, int list));
+int rename_buffer __ARGS((char_u *new_fname));
 void ex_file __ARGS((exarg_T *eap));
 void ex_update __ARGS((exarg_T *eap));
 void ex_write __ARGS((exarg_T *eap));