diff --git a/src/Umbraco.Core/Models/Membership/User.cs b/src/Umbraco.Core/Models/Membership/User.cs
index 34db13e75b..05dd818e04 100644
--- a/src/Umbraco.Core/Models/Membership/User.cs
+++ b/src/Umbraco.Core/Models/Membership/User.cs
@@ -119,8 +119,6 @@ namespace Umbraco.Cms.Core.Models.Membership
         private DateTime _lastPasswordChangedDate;
         private DateTime _lastLoginDate;
         private DateTime _lastLockoutDate;
-        private IDictionary<string, object> _additionalData;
-        private object _additionalDataLock = new object();
 
         //Custom comparer for enumerable
         private static readonly DelegateEqualityComparer<IEnumerable<int>> IntegerEnumerableComparer =