diff --git a/tmux.h b/tmux.h
index 17d3b81f..c3f7fff4 100644
--- a/tmux.h
+++ b/tmux.h
@@ -3421,6 +3421,7 @@ struct window	*window_create(u_int, u_int, u_int, u_int);
 void		 window_pane_set_event(struct window_pane *);
 struct window_pane *window_get_active_at(struct window *, u_int, u_int);
 struct window_pane *window_find_string(struct window *, const char *);
+int		 window_has_floating_panes(struct window *);
 int		 window_has_pane(struct window *, struct window_pane *);
 int		 window_set_active_pane(struct window *, struct window_pane *,
 		     int);
diff --git a/window-tree.c b/window-tree.c
index eeaafd4f..21029c00 100644
--- a/window-tree.c
+++ b/window-tree.c
@@ -249,7 +249,7 @@ window_tree_build_window(struct session *s, struct winlink *wl,
 	struct window_tree_itemdata	*item;
 	struct mode_tree_item		*mti;
 	char				*name, *text;
-	struct window_pane		*wp, *fwp, **l;
+	struct window_pane		*wp, **l;
 	u_int				 n, i;
 	int				 expanded;
 	struct format_tree		*ft;
@@ -267,15 +267,9 @@ window_tree_build_window(struct session *s, struct winlink *wl,
 	format_free(ft);
 
 	if (data->type == WINDOW_TREE_SESSION ||
-	    data->type == WINDOW_TREE_WINDOW) {
+	    data->type == WINDOW_TREE_WINDOW)
 		expanded = 0;
-		TAILQ_FOREACH(fwp, &wl->window->panes, entry) {
-			if (fwp->flags & PANE_FLOATING) {
-				expanded = 1;
-				break;
-			}
-		}
-	} else
+	else
 		expanded = 1;
 	mti = mode_tree_add(data->data, parent, item, (uint64_t)wl, name, text,
 	    expanded);
diff --git a/window.c b/window.c
index d4b97385..dc2d67cc 100644
--- a/window.c
+++ b/window.c
@@ -461,6 +461,18 @@ window_pane_send_resize(struct window_pane *wp, u_int sx, u_int sy)
 		fatal("ioctl failed");
 }
 
+int
+window_has_floating_panes(struct window *w)
+{
+	struct window_pane	*wp;
+
+	TAILQ_FOREACH(wp, &w->panes, entry) {
+		if (wp->flags & PANE_FLOATING)
+			return (1);
+	}
+	return (0);
+}
+
 int
 window_has_pane(struct window *w, struct window_pane *wp)
 {