diff --git a/app/assets/javascripts/post_tooltips.js.erb b/app/assets/javascripts/post_tooltips.js.erb
index 6e52f7cba..03cf21343 100644
--- a/app/assets/javascripts/post_tooltips.js.erb
+++ b/app/assets/javascripts/post_tooltips.js.erb
@@ -17,7 +17,7 @@ Danbooru.PostTooltip.QTIP_OPTIONS = {
     my: "top left",
     at: "bottom left",
     target: "mouse",
-    viewport: $(window),
+    // viewport: $(window), // XXX broken on jquery-ui 1.11; add back after upgrading to jquery-ui 1.12.
     adjust: {
       mouse: false,
       y: 25,