diff --git a/protocol/json/client_response.go b/protocol/json/client_response.go
index 5c53b1a..eddb1da 100644
--- a/protocol/json/client_response.go
+++ b/protocol/json/client_response.go
@@ -70,6 +70,7 @@ func newClientResponseCodec(r io.Reader, codec codec.Codec) (protocol.ClientResp
 	if nil == r {
 		return nil, io.EOF
 	}
+	decoder.UseNumber()
 
 	res := &clientResponse{}
 	err := decoder.Decode(res)
diff --git a/protocol/json/server_request.go b/protocol/json/server_request.go
index 9f0d955..a446101 100644
--- a/protocol/json/server_request.go
+++ b/protocol/json/server_request.go
@@ -42,6 +42,7 @@ func newServerRequestCodec(r io.Reader, codec codec.Codec) (protocol.ServerReque
 	if nil == r {
 		return nil, io.EOF
 	}
+	decoder.UseNumber()
 
 	req := &serverRequest{}
 	err := decoder.Decode(req)