diff --git a/pkg/rpc/request/txBuilder.go b/pkg/rpc/request/txBuilder.go
index e02ffbc77..f56803428 100644
--- a/pkg/rpc/request/txBuilder.go
+++ b/pkg/rpc/request/txBuilder.go
@@ -70,17 +70,14 @@ func ExpandArrayIntoScript(script *io.BinWriter, slice []Param) error {
 			}
 			emit.Int(script, int64(val))
 		case smartcontract.BoolType:
-			str, err := fp.Value.GetString()
-			if err != nil {
-				return err
+			val, ok := fp.Value.Value.(bool)
+			if !ok {
+				return errors.New("not a bool")
 			}
-			switch str {
-			case "true":
+			if val {
 				emit.Int(script, 1)
-			case "false":
+			} else {
 				emit.Int(script, 0)
-			default:
-				return errors.New("wrong boolean value")
 			}
 		case smartcontract.ArrayType:
 			val, err := fp.Value.GetArray()
diff --git a/pkg/rpc/request/tx_builder_test.go b/pkg/rpc/request/tx_builder_test.go
index ad445898d..c8e6b69ab 100644
--- a/pkg/rpc/request/tx_builder_test.go
+++ b/pkg/rpc/request/tx_builder_test.go
@@ -54,10 +54,10 @@ func TestInvocationScriptCreationGood(t *testing.T) {
 		ps:     Params{{Type: StringT, Value: "a"}, {Type: ArrayT, Value: []Param{{Type: FuncParamT, Value: FuncParam{Type: smartcontract.IntegerType, Value: Param{Type: NumberT, Value: 42}}}}}},
 		script: "002a11c01f0c01610c146f459162ceeb248b071ec157d9e4f6fd26fdbe5041627d5b52",
 	}, {
-		ps:     Params{{Type: StringT, Value: "a"}, {Type: ArrayT, Value: []Param{{Type: FuncParamT, Value: FuncParam{Type: smartcontract.BoolType, Value: Param{Type: StringT, Value: "true"}}}}}},
+		ps:     Params{{Type: StringT, Value: "a"}, {Type: ArrayT, Value: []Param{{Type: FuncParamT, Value: FuncParam{Type: smartcontract.BoolType, Value: Param{Type: BooleanT, Value: true}}}}}},
 		script: "1111c01f0c01610c146f459162ceeb248b071ec157d9e4f6fd26fdbe5041627d5b52",
 	}, {
-		ps:     Params{{Type: StringT, Value: "a"}, {Type: ArrayT, Value: []Param{{Type: FuncParamT, Value: FuncParam{Type: smartcontract.BoolType, Value: Param{Type: StringT, Value: "false"}}}}}},
+		ps:     Params{{Type: StringT, Value: "a"}, {Type: ArrayT, Value: []Param{{Type: FuncParamT, Value: FuncParam{Type: smartcontract.BoolType, Value: Param{Type: BooleanT, Value: false}}}}}},
 		script: "1011c01f0c01610c146f459162ceeb248b071ec157d9e4f6fd26fdbe5041627d5b52",
 	}}
 	for _, ps := range paramScripts {
diff --git a/pkg/rpc/server/server_test.go b/pkg/rpc/server/server_test.go
index 27d8be5a8..454733a1a 100644
--- a/pkg/rpc/server/server_test.go
+++ b/pkg/rpc/server/server_test.go
@@ -859,7 +859,7 @@ var rpcTestCases = map[string][]rpcTestCase{
 		},
 		{
 			name:   "positive, with arguments, result=true",
-			params: fmt.Sprintf(`["%s", [{"type": "String", "value": "good_string"}, {"type": "Integer", "value": "4"}, {"type":"Boolean", "value": "false"}]]`, verifyWithArgsContractHash),
+			params: fmt.Sprintf(`["%s", [{"type": "String", "value": "good_string"}, {"type": "Integer", "value": "4"}, {"type":"Boolean", "value": false}]]`, verifyWithArgsContractHash),
 			result: func(e *executor) interface{} { return &result.Invoke{} },
 			check: func(t *testing.T, e *executor, inv interface{}) {
 				res, ok := inv.(*result.Invoke)
@@ -877,7 +877,7 @@ var rpcTestCases = map[string][]rpcTestCase{
 		},
 		{
 			name:   "positive, with arguments, result=false",
-			params: fmt.Sprintf(`["%s", [{"type": "String", "value": "invalid_string"}, {"type": "Integer", "value": "4"}, {"type":"Boolean", "value": "false"}]]`, verifyWithArgsContractHash),
+			params: fmt.Sprintf(`["%s", [{"type": "String", "value": "invalid_string"}, {"type": "Integer", "value": "4"}, {"type":"Boolean", "value": false}]]`, verifyWithArgsContractHash),
 			result: func(e *executor) interface{} { return &result.Invoke{} },
 			check: func(t *testing.T, e *executor, inv interface{}) {
 				res, ok := inv.(*result.Invoke)