1 files changed, 1 insertions, 1 deletions
diff --git a/tmux.h b/tmux.h
index 645e5003..04088a16 100644
--- a/tmux.h
+++ b/tmux.h
@@ -1521,7 +1521,7 @@ int		 session_last(struct session *);
 
 /* utf8.c */
 void	utf8_build(void);
-int	utf8_width(u_char *);
+int	utf8_width(const u_char *);
 
 /* util.c */
 char   *section_string(char *, size_t, size_t, size_t);