diff --git a/src/Twilio/Rest/Domain.cs b/src/Twilio/Rest/Domain.cs
index bfa2139ab..b2b389717 100644
--- a/src/Twilio/Rest/Domain.cs
+++ b/src/Twilio/Rest/Domain.cs
@@ -58,7 +58,6 @@ public static implicit operator Domain(string value)
         public static readonly Domain Video = new Domain("video");
         public static readonly Domain Voice = new Domain("voice");
         public static readonly Domain Wireless = new Domain("wireless");
-        public static readonly Domain PreviewIam = new Domain("preview-iam");
     }
 
 }
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