diff --git a/app/assets/javascripts/discourse/mixins/scrolling.js.es6 b/app/assets/javascripts/discourse/mixins/scrolling.js.es6
index 718a770b679..c2997fa3954 100644
--- a/app/assets/javascripts/discourse/mixins/scrolling.js.es6
+++ b/app/assets/javascripts/discourse/mixins/scrolling.js.es6
@@ -19,7 +19,7 @@ const ScrollingDOMMethods = {
   },
 
   screenNotFull() {
-    return $(window).height() > $(document).height();
+    return $(window).height() > $("#main").height();
   }
 };