diff --git a/src/proto/message.pro b/src/proto/message.pro
index 54a0a77..1c11444 100644
--- a/src/proto/message.pro
+++ b/src/proto/message.pro
@@ -18,6 +18,7 @@
 char *msg_trunc_attr(char *s, int force, int attr);
 char_u *msg_may_trunc(int force, char_u *s);
 int delete_first_msg(void);
+void check_msg_hist(void);
 void ex_messages(exarg_T *eap);
 void msg_end_prompt(void);
 void wait_return(int redraw);