diff --git a/src/Umbraco.Web/Models/ContentEditing/Tab.cs b/src/Umbraco.Web/Models/ContentEditing/Tab.cs
index dd1c73b418..bf276ec2b4 100644
--- a/src/Umbraco.Web/Models/ContentEditing/Tab.cs
+++ b/src/Umbraco.Web/Models/ContentEditing/Tab.cs
@@ -23,5 +23,8 @@ namespace Umbraco.Web.Models.ContentEditing
 
         [DataMember(Name = "properties")]
         public IEnumerable<T> Properties { get; set; }
+
+        [DataMember(Name = "cssClass")]
+        public string CssClass { get; set; }
     }
-}
\ No newline at end of file
+}