diff --git a/lib/editor/atto/plugins/collapse/yui/build/moodle-atto_collapse-button/moodle-atto_collapse-button-debug.js b/lib/editor/atto/plugins/collapse/yui/build/moodle-atto_collapse-button/moodle-atto_collapse-button-debug.js
index c3740bfe3b8..848c5f0f2ef 100644
--- a/lib/editor/atto/plugins/collapse/yui/build/moodle-atto_collapse-button/moodle-atto_collapse-button-debug.js
+++ b/lib/editor/atto/plugins/collapse/yui/build/moodle-atto_collapse-button/moodle-atto_collapse-button-debug.js
@@ -55,7 +55,8 @@ Y.namespace('M.atto_collapse').Button = Y.Base.create('button', Y.M.editor_atto.
         }
 
         var button = this.addButton({
-            icon: M.util.image_url('icon', PLUGINNAME),
+            icon: 'icon',
+            iconComponent: PLUGINNAME,
             callback: this._toggle
         });
 
diff --git a/lib/editor/atto/plugins/collapse/yui/build/moodle-atto_collapse-button/moodle-atto_collapse-button-min.js b/lib/editor/atto/plugins/collapse/yui/build/moodle-atto_collapse-button/moodle-atto_collapse-button-min.js
index 509893951f3..f67c8b69487 100644
--- a/lib/editor/atto/plugins/collapse/yui/build/moodle-atto_collapse-button/moodle-atto_collapse-button-min.js
+++ b/lib/editor/atto/plugins/collapse/yui/build/moodle-atto_collapse-button/moodle-atto_collapse-button-min.js
@@ -1 +1 @@
-YUI.add("moodle-atto_collapse-button",function(e,t){var n="atto_collapse",r="showgroups",i="collapse",s="collapsed",o=".atto_group";e.namespace("M.atto_collapse").Button=e.Base.create("button",e.M.editor_atto.EditorPlugin,[],{initializer:function(){var t=e.Object.size(this.get("host").get("plugins"));if(t<=1+parseInt(this.get(r),10))return;if(this.toolbar.all(o).size()>this.get(r))return;var i=this.addButton({icon:M.util.image_url("icon",n),callback:this._toggle});this.get("host").on("pluginsloaded",function(e,t){this._setVisibility(t);var n=this.toolbar.all(o).item(this.get(r));n.insert('<div class="toolbarbreak"></div>',"before")},this,i)},_toggle:function(e){e.preventDefault();var t=this.buttons[i];t.getData(s)?(this.highlightButtons(i),this._setVisibility(t,!0)):(this.unHighlightButtons(i),this._setVisibility(t)),this.buttons[this.name].focus()},_setVisibility:function(e,t){var i=this.toolbar.all(o).slice(this.get(r));t?(e.set("title",M.util.get_string("showfewer",n)),i.show(),e.setData(s,!1)):(e.set("title",M.util.get_string("showmore",n)),i.hide(),e.setData(s,!0))}},{ATTRS:{showgroups:{value:3}}})},"@VERSION@",{requires:["moodle-editor_atto-plugin"]});
+YUI.add("moodle-atto_collapse-button",function(e,t){var n="atto_collapse",r="showgroups",i="collapse",s="collapsed",o=".atto_group";e.namespace("M.atto_collapse").Button=e.Base.create("button",e.M.editor_atto.EditorPlugin,[],{initializer:function(){var t=e.Object.size(this.get("host").get("plugins"));if(t<=1+parseInt(this.get(r),10))return;if(this.toolbar.all(o).size()>this.get(r))return;var i=this.addButton({icon:"icon",iconComponent:n,callback:this._toggle});this.get("host").on("pluginsloaded",function(e,t){this._setVisibility(t);var n=this.toolbar.all(o).item(this.get(r));n.insert('<div class="toolbarbreak"></div>',"before")},this,i)},_toggle:function(e){e.preventDefault();var t=this.buttons[i];t.getData(s)?(this.highlightButtons(i),this._setVisibility(t,!0)):(this.unHighlightButtons(i),this._setVisibility(t)),this.buttons[this.name].focus()},_setVisibility:function(e,t){var i=this.toolbar.all(o).slice(this.get(r));t?(e.set("title",M.util.get_string("showfewer",n)),i.show(),e.setData(s,!1)):(e.set("title",M.util.get_string("showmore",n)),i.hide(),e.setData(s,!0))}},{ATTRS:{showgroups:{value:3}}})},"@VERSION@",{requires:["moodle-editor_atto-plugin"]});
diff --git a/lib/editor/atto/plugins/collapse/yui/build/moodle-atto_collapse-button/moodle-atto_collapse-button.js b/lib/editor/atto/plugins/collapse/yui/build/moodle-atto_collapse-button/moodle-atto_collapse-button.js
index ee97f234f96..d4c0e9f4191 100644
--- a/lib/editor/atto/plugins/collapse/yui/build/moodle-atto_collapse-button/moodle-atto_collapse-button.js
+++ b/lib/editor/atto/plugins/collapse/yui/build/moodle-atto_collapse-button/moodle-atto_collapse-button.js
@@ -51,7 +51,8 @@ Y.namespace('M.atto_collapse').Button = Y.Base.create('button', Y.M.editor_atto.
         }
 
         var button = this.addButton({
-            icon: M.util.image_url('icon', PLUGINNAME),
+            icon: 'icon',
+            iconComponent: PLUGINNAME,
             callback: this._toggle
         });
 
diff --git a/lib/editor/atto/plugins/collapse/yui/src/button/js/button.js b/lib/editor/atto/plugins/collapse/yui/src/button/js/button.js
index 0576996bf79..c00b9a8188f 100644
--- a/lib/editor/atto/plugins/collapse/yui/src/button/js/button.js
+++ b/lib/editor/atto/plugins/collapse/yui/src/button/js/button.js
@@ -53,7 +53,8 @@ Y.namespace('M.atto_collapse').Button = Y.Base.create('button', Y.M.editor_atto.
         }
 
         var button = this.addButton({
-            icon: M.util.image_url('icon', PLUGINNAME),
+            icon: 'icon',
+            iconComponent: PLUGINNAME,
             callback: this._toggle
         });