diff --git a/src/proto/term.pro b/src/proto/term.pro
index 8c56f62..13a093c 100644
--- a/src/proto/term.pro
+++ b/src/proto/term.pro
@@ -86,5 +86,5 @@
 void swap_tcap(void);
 void ansi_color2rgb(int nr, char_u *r, char_u *g, char_u *b, char_u *ansi_idx);
 void cterm_color2rgb(int nr, char_u *r, char_u *g, char_u *b, char_u *ansi_idx);
-void term_replace_bs_del_keycode(char_u *ta_buf, int ta_len, int len);
+int term_replace_bs_del_keycode(char_u *ta_buf, int ta_len, int len_arg);
 /* vim: set ft=c : */