diff --git a/format.c b/format.c
index eb4664d1..2be9834f 100644
--- a/format.c
+++ b/format.c
@@ -729,6 +729,8 @@ format_defaults_pane(struct format_tree *ft, struct window_pane *wp)
 	format_add(ft, "wrap_flag", "%d",
 	    !!(wp->base.mode & MODE_WRAP));
 
+	format_add(ft, "mouse_any_flag", "%d",
+	    !!(wp->base.mode & (MODE_MOUSE_STANDARD|MODE_MOUSE_BUTTON)));
 	format_add(ft, "mouse_standard_flag", "%d",
 	    !!(wp->base.mode & MODE_MOUSE_STANDARD));
 	format_add(ft, "mouse_button_flag", "%d",