diff --git a/src/proto/charset.pro b/src/proto/charset.pro
index 472f1cd..72eed4b 100644
--- a/src/proto/charset.pro
+++ b/src/proto/charset.pro
@@ -19,8 +19,9 @@
 int win_linetabsize __ARGS((win_T *wp, char_u *p, colnr_T len));
 int vim_isIDc __ARGS((int c));
 int vim_iswordc __ARGS((int c));
+int vim_iswordc_buf __ARGS((int c, buf_T *buf));
 int vim_iswordp __ARGS((char_u *p));
-int vim_iswordc_buf __ARGS((char_u *p, buf_T *buf));
+int vim_iswordp_buf __ARGS((char_u *p, buf_T *buf));
 int vim_isfilec __ARGS((int c));
 int vim_isfilec_or_wc __ARGS((int c));
 int vim_isprintc __ARGS((int c));