diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5fc00d7..606078e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,13 @@ Changelog
 =========
 All notable changes to this project will be documented in this file.
 
+v1.0.34-alpha
+-------------
+
+### Changed
+
+- Fixed response struct unmarshalling issue
+
 v1.0.33-alpha
 -------------
 
diff --git a/README.md b/README.md
index 9818a27..b889e75 100644
--- a/README.md
+++ b/README.md
@@ -25,7 +25,7 @@ Installation
 -----------------
 
 ```bash
-go get github.com/amir-the-h/okex@v1.0.33-alpha
+go get github.com/amir-the-h/okex@v1.0.34-alpha
 ```
 
 Usage
diff --git a/definitions.go b/definitions.go
index e75e171..d8e3b2a 100644
--- a/definitions.go
+++ b/definitions.go
@@ -299,7 +299,7 @@ const (
 	CandleStick1m  = CandleStickWsBarSize("candle1m")
 )
 
-func (t JSONTime) String() string { return time.Time(t).String() }
+func (t *JSONTime) String() string { return (time.Time)(*t).String() }
 
 func (t *JSONTime) UnmarshalJSON(s []byte) (err error) {
 	r := strings.Replace(string(s), `"`, ``, -1)
diff --git a/requests/rest/tradedata/trade_data_requests.go b/requests/rest/tradedata/trade_data_requests.go
index a536483..e6a9328 100644
--- a/requests/rest/tradedata/trade_data_requests.go
+++ b/requests/rest/tradedata/trade_data_requests.go
@@ -7,7 +7,7 @@ type (
 		Ccy      string              `json:"ccy"`
 		Begin    int64               `json:"before,omitempty,string"`
 		End      int64               `json:"limit,omitempty,string"`
-		InstType okex.InstrumentType `json:"instType,string"`
+		InstType okex.InstrumentType `json:"instType"`
 		Period   okex.BarSize        `json:"period,string,omitempty"`
 	}
 	GetRatio struct {
diff --git a/responses/responses.go b/responses/responses.go
index 3e4132b..220e710 100644
--- a/responses/responses.go
+++ b/responses/responses.go
@@ -1,28 +1,8 @@
 package responses
 
-import (
-	"encoding/json"
-	"fmt"
-)
-
 type (
 	Basic struct {
 		Code int    `json:"code,string"`
 		Msg  string `json:"msg,omitempty"`
 	}
 )
-
-type resCode Basic
-
-func (b *Basic) UnmarshalJSON(bf []byte) error {
-	var r resCode
-	err := json.Unmarshal(bf, &r)
-	if err != nil {
-		return err
-	}
-	b = (*Basic)(&r)
-	if b.Code != 0 {
-		return fmt.Errorf("recevied error:%+v", b)
-	}
-	return nil
-}