diff --git a/src/proto/buffer.pro b/src/proto/buffer.pro
index 91494db..5e1aa7a 100644
--- a/src/proto/buffer.pro
+++ b/src/proto/buffer.pro
@@ -8,7 +8,7 @@
 void buf_freeall(buf_T *buf, int flags);
 void goto_buffer(exarg_T *eap, int start, int dir, int count);
 void handle_swap_exists(bufref_T *old_curbuf);
-char_u *do_bufdel(int command, char_u *arg, int addr_count, int start_bnr, int end_bnr, int forceit);
+char *do_bufdel(int command, char_u *arg, int addr_count, int start_bnr, int end_bnr, int forceit);
 int do_buffer(int action, int start, int dir, int count, int forceit);
 void set_curbuf(buf_T *buf, int action);
 void enter_buffer(buf_T *buf);