diff --git a/api/i_xyrobot_ctrl_module.hpp b/api/i_xyrobot_ctrl_module.hpp
index 71e6395..fcfbb13 100644
--- a/api/i_xyrobot_ctrl_module.hpp
+++ b/api/i_xyrobot_ctrl_module.hpp
@@ -33,9 +33,9 @@ class I_XYRobotCtrlModule {
 
   typedef struct {
     uint8_t status;
+    u8      iostate;  // x_zero_io y_zero_io
     int32_t x;
     int32_t y;
-    u8      iostate;  // x_zero_io y_zero_io
   } detailed_status_t;
 
   /*******************************************************************************