diff --git a/src/proto/term.pro b/src/proto/term.pro
index 66c4c2e..9958763 100644
--- a/src/proto/term.pro
+++ b/src/proto/term.pro
@@ -50,7 +50,7 @@
 char_u *get_termcode __ARGS((int i));
 void del_termcode __ARGS((char_u *name));
 void set_mouse_topline __ARGS((win_T *wp));
-int check_termcode __ARGS((int max_offset, char_u *buf, int buflen));
+int check_termcode __ARGS((int max_offset, char_u *buf, int bufsize, int *buflen));
 char_u *replace_termcodes __ARGS((char_u *from, char_u **bufp, int from_part, int do_lt, int special));
 int find_term_bykeys __ARGS((char_u *src));
 void show_termcodes __ARGS((void));