diff --git a/src/neo/SmartContract/Native/NativeContract.cs b/src/neo/SmartContract/Native/NativeContract.cs
index 2b704e0510..391c01eb95 100644
--- a/src/neo/SmartContract/Native/NativeContract.cs
+++ b/src/neo/SmartContract/Native/NativeContract.cs
@@ -167,6 +167,8 @@ private static ContractParameterType ToParameterType(Type type)
             if (type == typeof(BigInteger)) return ContractParameterType.Integer;
             if (type == typeof(byte[])) return ContractParameterType.ByteArray;
             if (type == typeof(string)) return ContractParameterType.String;
+            if (type == typeof(UInt160)) return ContractParameterType.Hash160;
+            if (type == typeof(UInt256)) return ContractParameterType.Hash256;
             if (type == typeof(VM.Types.Boolean)) return ContractParameterType.Boolean;
             if (type == typeof(Integer)) return ContractParameterType.Integer;
             if (type == typeof(ByteString)) return ContractParameterType.ByteArray;