diff --git a/src/Core/Models/TwoFactorProvider.cs b/src/Core/Models/TwoFactorProvider.cs
index f017e0ac56..c5c49d6710 100644
--- a/src/Core/Models/TwoFactorProvider.cs
+++ b/src/Core/Models/TwoFactorProvider.cs
@@ -1,6 +1,5 @@
 using Bit.Core.Enums;
 using Newtonsoft.Json;
-using System;
 using System.Collections.Generic;
 using U2F.Core.Utils;