1 files changed, 1 insertions, 0 deletions
diff --git a/include/rtdef.h b/include/rtdef.h
index a3d13bfc44..6caf713f45 100644
--- a/include/rtdef.h
+++ b/include/rtdef.h
@@ -739,6 +739,7 @@ enum rt_device_class_type
     RT_Device_Class_SPIDevice,                          /**< SPI device */
     RT_Device_Class_SDIO,                               /**< SDIO bus device */
     RT_Device_Class_PM,                                 /**< PM pseudo device */
+    RT_Device_Class_Pipe,                               /**< Pipe device */
     RT_Device_Class_Miscellaneous,                      /**< Miscellaneous device */
     RT_Device_Class_Unknown                             /**< unknown device */
 };