diff --git a/pkg/smartcontract/parameter.go b/pkg/smartcontract/parameter.go
index 36d32f226..379a75593 100644
--- a/pkg/smartcontract/parameter.go
+++ b/pkg/smartcontract/parameter.go
@@ -63,9 +63,7 @@ func (p *Parameter) MarshalJSON() ([]byte, error) {
 		resultErr      error
 	)
 	switch p.Type {
-	case Hash160Type:
-		resultRawValue, resultErr = json.Marshal(p.Value.(util.Uint160).Reverse()) // Hash160 should be marshaled in BE but default marshaler uses LE.
-	case BoolType, StringType, Hash256Type:
+	case BoolType, StringType, Hash160Type, Hash256Type:
 		resultRawValue, resultErr = json.Marshal(p.Value)
 	case IntegerType:
 		val, ok := p.Value.(int64)
@@ -161,7 +159,7 @@ func (p *Parameter) UnmarshalJSON(data []byte) (err error) {
 		if err = json.Unmarshal(r.Value, &h); err != nil {
 			return
 		}
-		p.Value = h.Reverse() // Hash160 should be marshaled in BE but default marshaler uses LE.
+		p.Value = h
 	case Hash256Type:
 		var h util.Uint256
 		if err = json.Unmarshal(r.Value, &h); err != nil {
diff --git a/pkg/smartcontract/parameter_test.go b/pkg/smartcontract/parameter_test.go
index 77fec6c21..61d2fd6a6 100644
--- a/pkg/smartcontract/parameter_test.go
+++ b/pkg/smartcontract/parameter_test.go
@@ -104,8 +104,8 @@ var marshalJSONTestCases = []struct {
 		input: Parameter{
 			Type: Hash160Type,
 			Value: util.Uint160{
-				0x0b, 0xcd, 0x29, 0x78, 0x63, 0x4d, 0x96, 0x1c, 0x24, 0xf5,
-				0xae, 0xa0, 0x80, 0x22, 0x97, 0xff, 0x12, 0x87, 0x24, 0xd6,
+				0xd6, 0x24, 0x87, 0x12, 0xff, 0x97, 0x22, 0x80, 0xa0, 0xae,
+				0xf5, 0x24, 0x1c, 0x96, 0x4d, 0x63, 0x78, 0x29, 0xcd, 0xb,
 			},
 		},
 		result: `{"type":"Hash160","value":"0x0bcd2978634d961c24f5aea0802297ff128724d6"}`,
@@ -197,8 +197,8 @@ var unmarshalJSONTestCases = []struct {
 		result: Parameter{
 			Type: Hash160Type,
 			Value: util.Uint160{
-				0x0b, 0xcd, 0x29, 0x78, 0x63, 0x4d, 0x96, 0x1c, 0x24, 0xf5,
-				0xae, 0xa0, 0x80, 0x22, 0x97, 0xff, 0x12, 0x87, 0x24, 0xd6,
+				0xd6, 0x24, 0x87, 0x12, 0xff, 0x97, 0x22, 0x80, 0xa0, 0xae,
+				0xf5, 0x24, 0x1c, 0x96, 0x4d, 0x63, 0x78, 0x29, 0xcd, 0xb,
 			},
 		},
 	},