1 files changed, 1 insertions, 0 deletions
diff --git a/tmux.h b/tmux.h
index 955643d8..c98d4c51 100644
--- a/tmux.h
+++ b/tmux.h
@@ -1168,6 +1168,7 @@ struct tty {
 
 	u_int		 mouse_last_x;
 	u_int		 mouse_last_y;
+	u_int		 mouse_last_b;
 	int		 mouse_drag_flag;
 	void		(*mouse_drag_update)(struct client *,
 			    struct mouse_event *);