diff --git a/protocol/json/client.go b/protocol/json/client.go
index bce8333..bf52930 100644
--- a/protocol/json/client.go
+++ b/protocol/json/client.go
@@ -158,14 +158,18 @@ func (ccrn *ClientCodecResponseOrNotify) Complete() {
 var clientRequestPool sync.Pool
 
 func retainClientRequest(method string, params interface{}, id interface{}) *clientRequest {
+	var cr *clientRequest
 	v := clientRequestPool.Get()
 	if v == nil {
-		return &clientRequest{}
+		cr = &clientRequest{}
+	} else {
+		cr = v.(*clientRequest)
 	}
-	cr := v.(*clientRequest)
+
 	cr.Method = method
 	cr.Params = params
 	cr.ID = id
+
 	return cr
 }
 
diff --git a/protocol/json/server.go b/protocol/json/server.go
index 566c1d6..4e50388 100644
--- a/protocol/json/server.go
+++ b/protocol/json/server.go
@@ -226,12 +226,14 @@ type EmptyResponse struct {
 var serverCodecRequestPool sync.Pool
 
 func retainServerCodecRequest(request *serverRequest, err error, encoder encode.Encoder) *ServerCodecRequest {
+	var scr *ServerCodecRequest
 	v := serverCodecRequestPool.Get()
 	if v == nil {
-		return &ServerCodecRequest{}
+		scr = &ServerCodecRequest{}
+	} else {
+		scr = v.(*ServerCodecRequest)
 	}
 
-	scr := v.(*ServerCodecRequest)
 	scr.request = request
 	scr.err = err
 	scr.encoder = encoder
@@ -268,11 +270,14 @@ func releaseServerRequest(sr *serverRequest) {
 var serverResponsePool sync.Pool
 
 func retainServerResponse(version string, result interface{}, err *Error, id *json.RawMessage) *serverResponse {
+	var sr *serverResponse
 	v := serverResponsePool.Get()
 	if v == nil {
-		return &serverResponse{}
+		sr = &serverResponse{}
+	} else {
+		sr = v.(*serverResponse)
 	}
-	sr := v.(*serverResponse)
+
 	sr.Version = version
 	sr.Result = result
 	sr.Error = err