diff --git a/src/Neo/SmartContract/Native/ContractEventAttribute.cs b/src/Neo/SmartContract/Native/ContractEventAttribute.cs
index b5410536fa..b2ff30891a 100644
--- a/src/Neo/SmartContract/Native/ContractEventAttribute.cs
+++ b/src/Neo/SmartContract/Native/ContractEventAttribute.cs
@@ -66,6 +66,13 @@ public ContractEventAttribute(int order, string name, string arg1Name, ContractP
             ActiveIn = activeIn;
         }
 
+        public ContractEventAttribute(Hardfork activeIn, int order, string name,
+            string arg1Name, ContractParameterType arg1Value,
+            string arg2Name, ContractParameterType arg2Value, Hardfork deprecatedIn) : this(activeIn, order, name, arg1Name, arg1Value, arg2Name, arg2Value)
+        {
+            DeprecatedIn = deprecatedIn;
+        }
+
         public ContractEventAttribute(int order, string name,
             string arg1Name, ContractParameterType arg1Value,
             string arg2Name, ContractParameterType arg2Value)
@@ -90,6 +97,14 @@ public ContractEventAttribute(int order, string name, string arg1Name, ContractP
             };
         }
 
+        public ContractEventAttribute(int order, string name,
+           string arg1Name, ContractParameterType arg1Value,
+           string arg2Name, ContractParameterType arg2Value, Hardfork deprecatedIn) : this(order, name, arg1Name, arg1Value, arg2Name, arg2Value)
+        {
+            DeprecatedIn = deprecatedIn;
+        }
+
+
         public ContractEventAttribute(Hardfork activeIn, int order, string name,
             string arg1Name, ContractParameterType arg1Value,
             string arg2Name, ContractParameterType arg2Value,
diff --git a/src/Neo/SmartContract/Native/NativeContract.cs b/src/Neo/SmartContract/Native/NativeContract.cs
index 77a941fc41..b030f06c9b 100644
--- a/src/Neo/SmartContract/Native/NativeContract.cs
+++ b/src/Neo/SmartContract/Native/NativeContract.cs
@@ -208,7 +208,7 @@ private NativeContractsCache.CacheEntry GetAllowedMethods(IsHardforkEnabledDeleg
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public ContractState GetContractState(ProtocolSettings settings, uint blockHeight) => GetContractState(settings.IsHardforkEnabled, blockHeight);
 
-        private static bool IsActive(IHardforkActivable u, IsHardforkEnabledDelegate hfChecker, uint blockHeight)
+        internal static bool IsActive(IHardforkActivable u, IsHardforkEnabledDelegate hfChecker, uint blockHeight)
         {
             return  // no hardfork is involved
                     u.ActiveIn is null && u.DeprecatedIn is null ||
diff --git a/tests/Neo.UnitTests/SmartContract/Native/UT_NativeContract.cs b/tests/Neo.UnitTests/SmartContract/Native/UT_NativeContract.cs
index 1989b4323b..4b437dd866 100644
--- a/tests/Neo.UnitTests/SmartContract/Native/UT_NativeContract.cs
+++ b/tests/Neo.UnitTests/SmartContract/Native/UT_NativeContract.cs
@@ -9,6 +9,7 @@
 // Redistribution and use in source and binary forms with or without
 // modifications are permitted.
 
+using Akka.Util;
 using FluentAssertions;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 using Neo.Network.P2P.Payloads;
@@ -58,6 +59,28 @@ public void Clean()
             TestBlockchain.ResetStore();
         }
 
+        class active : IHardforkActivable
+        {
+            public Hardfork? ActiveIn { get; init; }
+            public Hardfork? DeprecatedIn { get; init; }
+        }
+
+        [TestMethod]
+        public void TestActiveDeprecatedIn()
+        {
+            string json = UT_ProtocolSettings.CreateHKSettings("\"HF_Cockatrice\": 20");
+            var file = Path.GetTempFileName();
+            File.WriteAllText(file, json);
+            ProtocolSettings settings = ProtocolSettings.Load(file, false);
+            File.Delete(file);
+
+            Assert.IsFalse(NativeContract.IsActive(new active() { ActiveIn = Hardfork.HF_Cockatrice, DeprecatedIn = null }, settings.IsHardforkEnabled, 1));
+            Assert.IsTrue(NativeContract.IsActive(new active() { ActiveIn = Hardfork.HF_Cockatrice, DeprecatedIn = null }, settings.IsHardforkEnabled, 20));
+
+            Assert.IsTrue(NativeContract.IsActive(new active() { ActiveIn = null, DeprecatedIn = Hardfork.HF_Cockatrice }, settings.IsHardforkEnabled, 1));
+            Assert.IsFalse(NativeContract.IsActive(new active() { ActiveIn = null, DeprecatedIn = Hardfork.HF_Cockatrice }, settings.IsHardforkEnabled, 20));
+        }
+
         [TestMethod]
         public void TestGetContract()
         {