diff --git a/ckeditor/ckeditor-tests.ts b/ckeditor/ckeditor-tests.ts
index aa052b8ee..f7deb6706 100644
--- a/ckeditor/ckeditor-tests.ts
+++ b/ckeditor/ckeditor-tests.ts
@@ -282,7 +282,6 @@ function test_adding_dialog_by_definition() {
 
 function test_adding_plugin() {
     CKEDITOR.plugins.add( 'abbr', {
-        icons: 'abbr',
         init: function( editor: CKEDITOR.editor ) {
             // empty logic
         }