diff --git a/decode_test.go b/decode_test.go
index 67ab32a..200ab4d 100644
--- a/decode_test.go
+++ b/decode_test.go
@@ -863,7 +863,7 @@ var badUTF8 = []struct {
 	{"\xff", `"\ufffd"`},
 	{"\xff\xff", `"\ufffd\ufffd"`},
 	{"a\xffb", `"a\ufffdb"`},
-	{"\xe6\x97\xa5\xe6\x9c\xac\xff\xaa\x9e", `"日本\ufffd\ufffd\ufffd"`},
+	{"\xe6\x97\xa5\xe6\x9c\xac\xff\xaa\x9e", `"\u65E5\u672C\ufffd\ufffd\ufffd"`},
 }
 
 func TestMarshalBadUTF8(t *testing.T) {
diff --git a/encode.go b/encode.go
index f3e86aa..a871f8c 100644
--- a/encode.go
+++ b/encode.go
@@ -24,6 +24,7 @@ import (
 	"sync"
 	"sync/atomic"
 	"unicode"
+	"unicode/utf16"
 	"unicode/utf8"
 	// new in golang 1.9
 	"golang.org/x/sync/syncmap"
@@ -966,7 +967,17 @@ func (e *encodeState) string(s string, escapeHTML bool) int {
 			start = i
 			continue
 		}
+		if start < i {
+			e.WriteString(s[start:i])
+		}
+		if c < 0x10000 {
+			e.WriteString(fmt.Sprintf(`\u%04X`, c))
+		} else {
+			r1, r2 := utf16.EncodeRune(c)
+			e.WriteString(fmt.Sprintf(`\u%04X\u%04X`, r1, r2))
+		}
 		i += size
+		start = i
 	}
 	if start < len(s) {
 		e.WriteString(s[start:])
@@ -1043,7 +1054,17 @@ func (e *encodeState) stringBytes(s []byte, escapeHTML bool) int {
 			start = i
 			continue
 		}
+		if start < i {
+			e.Write(s[start:i])
+		}
+		if c < 0x10000 {
+			e.WriteString(fmt.Sprintf(`\u%04X`, c))
+		} else {
+			r1, r2 := utf16.EncodeRune(c)
+			e.WriteString(fmt.Sprintf(`\u%04X\u%04X`, r1, r2))
+		}
 		i += size
+		start = i
 	}
 	if start < len(s) {
 		e.Write(s[start:])
diff --git a/encode_test.go b/encode_test.go
index 39152b0..9daa736 100644
--- a/encode_test.go
+++ b/encode_test.go
@@ -231,6 +231,19 @@ func (CText) MarshalText() ([]byte, error) {
 	return []byte(`"<&>"`), nil
 }
 
+
+func TestMarshaler_NeoGo_PR2174(t *testing.T) {
+	source := "IOU（欠条币）：一种支持负数的NEP-17（非严格意义上的）资产，合约无存储区，账户由区块链浏览器统计"
+	b, err := Marshal(source)
+	if err != nil {
+		t.Fatalf("Marshal(c): %v", err)
+	}
+	want := `"` + `IOU\uFF08\u6B20\u6761\u5E01\uFF09\uFF1A\u4E00\u79CD\u652F\u6301\u8D1F\u6570\u7684NEP-17\uFF08\u975E\u4E25\u683C\u610F\u4E49\u4E0A\u7684\uFF09\u8D44\u4EA7\uFF0C\u5408\u7EA6\u65E0\u5B58\u50A8\u533A\uFF0C\u8D26\u6237\u7531\u533A\u5757\u94FE\u6D4F\u89C8\u5668\u7EDF\u8BA1` + `"`
+	if got := string(b); got != want {
+		t.Errorf("Marshal(c) = %#q, want %#q", got, want)
+	}
+}
+
 func TestMarshalerEscaping(t *testing.T) {
 	var c C
 	want := `"\u003c\u0026\u003e"`
diff --git a/stream_test.go b/stream_test.go
index d0b3ffb..5be216b 100644
--- a/stream_test.go
+++ b/stream_test.go
@@ -36,7 +36,7 @@ null
 true
 false
 ["a","b","c"]
-{"ß":"long s","K":"Kelvin"}
+{"\u00DF":"long s","\u212A":"Kelvin"}
 3.14
 `
 
@@ -71,8 +71,8 @@ false
 >."c"
 >]
 {
->."ß": "long s",
->."K": "Kelvin"
+>."\u00DF": "long s",
+>."\u212A": "Kelvin"
 >}
 3.14
 `