diff --git a/zscanprotocol.hpp b/zscanprotocol.hpp
index f7d33db..f6398ab 100644
--- a/zscanprotocol.hpp
+++ b/zscanprotocol.hpp
@@ -43,6 +43,10 @@ typedef struct {
   uint8_t  params[];
 } zcanbus_packet_t;
 
+#pragma pack()
+
+}  // namespace zscanprotocol
+namespace err {
 typedef enum {
   kerr_noerror              = 0,
   kerr_overtime             = 1,
@@ -50,9 +54,6 @@ typedef enum {
   kerr_invalid_param_num    = 3,
   kerr_subdevice_offline    = 4,
   kerr_function_not_support = 5,
-
 } common_ecode_t;
-#pragma pack()
-
-}  // namespace zscanprotocol
+}
 }  // namespace iflytop