diff --git a/javascripts/discourse/initializers/preview-edits.js.es6 b/javascripts/discourse/initializers/preview-edits.js.es6
index 08e4d17..5a84d87 100644
--- a/javascripts/discourse/initializers/preview-edits.js.es6
+++ b/javascripts/discourse/initializers/preview-edits.js.es6
@@ -191,7 +191,6 @@ export default {
           this.set("hasThumbnail", (this.get("thumbnails") || settings.topic_list_default_thumbnail) && this.get("showThumbnail"));
           this._setUpColour();
           if (this.get("tilesStyle")) {
-            this.set("classNames", this.classNames.concat("tiles-grid-item"));
             if (settings.topic_list_tiles_larger_featured_tiles && topic.tags) {
               if (
                 topic.tags.filter(