diff --git a/src/neo/Network/P2P/Payloads/OracleResponse.cs b/src/neo/Network/P2P/Payloads/OracleResponse.cs
index c979c2e143..aaf082ba55 100644
--- a/src/neo/Network/P2P/Payloads/OracleResponse.cs
+++ b/src/neo/Network/P2P/Payloads/OracleResponse.cs
@@ -71,7 +71,7 @@ public override bool Verify(StoreView snapshot, Transaction tx)
             OracleRequest request = NativeContract.Oracle.GetRequest(snapshot, Id);
             if (request is null) return false;
             if (tx.NetworkFee + tx.SystemFee != request.GasForResponse) return false;
-            UInt160 oracleAccount = Blockchain.GetConsensusAddress(NativeContract.Designate.GetDesignatedByRole(snapshot, Role.Oracle, snapshot.Height));
+            UInt160 oracleAccount = Blockchain.GetConsensusAddress(NativeContract.Designate.GetDesignatedByRole(snapshot, Role.Oracle, snapshot.Height + 1));
             return tx.Signers.Any(p => p.Account.Equals(oracleAccount));
         }
     }
diff --git a/src/neo/SmartContract/Native/Designate/DesignateContract.cs b/src/neo/SmartContract/Native/Designate/DesignateContract.cs
index 2587c0025d..b6e0fbe248 100644
--- a/src/neo/SmartContract/Native/Designate/DesignateContract.cs
+++ b/src/neo/SmartContract/Native/Designate/DesignateContract.cs
@@ -30,7 +30,7 @@ public ECPoint[] GetDesignatedByRole(StoreView snapshot, Role role, uint index)
         {
             if (!Enum.IsDefined(typeof(Role), role))
                 throw new ArgumentOutOfRangeException(nameof(role));
-            if (snapshot.Height + 2 < index)
+            if (snapshot.Height + 1 < index)
                 throw new ArgumentOutOfRangeException(nameof(index));
             byte[] key = CreateStorageKey((byte)role).AddBigEndian(index).ToArray();
             byte[] boundary = CreateStorageKey((byte)role).ToArray();
diff --git a/src/neo/SmartContract/Native/Oracle/OracleContract.cs b/src/neo/SmartContract/Native/Oracle/OracleContract.cs
index 436644e55b..c1b06f228c 100644
--- a/src/neo/SmartContract/Native/Oracle/OracleContract.cs
+++ b/src/neo/SmartContract/Native/Oracle/OracleContract.cs
@@ -107,7 +107,7 @@ protected override void PostPersist(ApplicationEngine engine)
                 if (list.Count == 0) engine.Snapshot.Storages.Delete(key);
 
                 //Mint GAS for oracle nodes
-                nodes ??= NativeContract.Designate.GetDesignatedByRole(engine.Snapshot, Role.Oracle, engine.Snapshot.Height).Select(p => (Contract.CreateSignatureRedeemScript(p).ToScriptHash(), BigInteger.Zero)).ToArray();
+                nodes ??= NativeContract.Designate.GetDesignatedByRole(engine.Snapshot, Role.Oracle, engine.Snapshot.PersistingBlock.Index).Select(p => (Contract.CreateSignatureRedeemScript(p).ToScriptHash(), BigInteger.Zero)).ToArray();
                 if (nodes.Length > 0)
                 {
                     int index = (int)(response.Id % (ulong)nodes.Length);