1 files changed, 1 insertions, 0 deletions
diff --git a/tmux.h b/tmux.h
index fa5b6b50..7a83732e 100644
--- a/tmux.h
+++ b/tmux.h
@@ -3118,6 +3118,7 @@ void	control_notify_session_window_changed(struct session *);
 
 /* session.c */
 extern struct sessions sessions;
+extern u_int next_session_id;
 int	session_cmp(struct session *, struct session *);
 RB_PROTOTYPE(sessions, session, entry, session_cmp);
 int		 session_alive(struct session *);