diff --git a/umap/static/umap/js/umap.slideshow.js b/umap/static/umap/js/umap.slideshow.js
index 78f006d5..b24f6055 100644
--- a/umap/static/umap/js/umap.slideshow.js
+++ b/umap/static/umap/js/umap.slideshow.js
@@ -91,7 +91,7 @@ L.U.Slideshow = L.Class.extend({
     play: function () {
         if (this._id) return;
         if (this.map.editEnabled) return;
-        L.DomUtil.addClass(document.body, L.U.Slideshow.CL.USNAME);
+        L.DomUtil.addClass(document.body, L.U.Slideshow.CLASSNAME);
         this._id = window.setInterval(L.bind(this.loop, this), this.options.delay);
         this.resetSpinners();
         this.loop();
@@ -104,7 +104,7 @@ L.U.Slideshow = L.Class.extend({
 
     pause: function () {
         if (this._id) {
-            L.DomUtil.removeClass(document.body, L.U.Slideshow.CL.USNAME);
+            L.DomUtil.removeClass(document.body, L.U.Slideshow.CLASSNAME);
             window.clearInterval(this._id);
             this._id = null;
         }