diff --git a/include/rtdef.h b/include/rtdef.h
index 67fda14610..6bd8ed002e 100644
--- a/include/rtdef.h
+++ b/include/rtdef.h
@@ -628,7 +628,8 @@ enum rt_device_class_type
     RT_Device_Class_RTC,                            /**< RTC device                                 */
     RT_Device_Class_Sound,                          /**< Sound device                               */
     RT_Device_Class_Graphic,                        /**< Graphic device                             */
-    RT_Device_Class_I2C,                            /**< I2C device                                 */
+    RT_Device_Class_I2CBUS,                         /**< I2C bus device                                 */
+    RT_Device_Class_I2CDevice,                      /**< I2C device                                 */
     RT_Device_Class_USBDevice,                      /**< USB slave device                           */
     RT_Device_Class_USBHost,                        /**< USB host bus                               */
     RT_Device_Class_SPIBUS,                         /**< SPI bus device                             */