diff --git a/DnsServerCore/Dns/Zones/PrimaryZone.cs b/DnsServerCore/Dns/Zones/PrimaryZone.cs
index d71334b6..3a49a462 100644
--- a/DnsServerCore/Dns/Zones/PrimaryZone.cs
+++ b/DnsServerCore/Dns/Zones/PrimaryZone.cs
@@ -36,6 +36,7 @@ namespace DnsServerCore.Dns.Zones
         readonly bool _internal;
 
         readonly List<DnsResourceRecord> _history; //for IXFR support
+        IReadOnlyDictionary<string, string> _tsigKeys;
 
         readonly Timer _notifyTimer;
         bool _notifyTimerTriggered;
@@ -59,6 +60,8 @@ namespace DnsServerCore.Dns.Zones
             else
                 _history = new List<DnsResourceRecord>(zoneInfo.ZoneHistory);
 
+            _tsigKeys = zoneInfo.TsigKeys;
+
             _notifyTimer = new Timer(NotifyTimerCallback, null, Timeout.Infinite, Timeout.Infinite);
             _notifyList = new List<NameServerAddress>();
         }
@@ -467,6 +470,12 @@ namespace DnsServerCore.Dns.Zones
             }
         }
 
+        public IReadOnlyDictionary<string, string> TsigKeys
+        {
+            get { return _tsigKeys; }
+            set { _tsigKeys = value; }
+        }
+
         #endregion
     }
 }