diff --git a/include/rtdef.h b/include/rtdef.h
index d79c745078..a0bfeb48be 100644
--- a/include/rtdef.h
+++ b/include/rtdef.h
@@ -540,7 +540,7 @@ struct rt_object_information
 #define RT_TIMER_CTRL_GET_FUNC          0x6             /**< get timer timeout func  */
 #define RT_TIMER_CTRL_SET_FUNC          0x7             /**< set timer timeout func  */
 #define RT_TIMER_CTRL_GET_PARM          0x8             /**< get timer parameter  */
-#define RT_TIMER_CTRL_SET_PARM          0x9             /**< get timer parameter  */
+#define RT_TIMER_CTRL_SET_PARM          0x9             /**< set timer parameter  */
 
 #ifndef RT_TIMER_SKIP_LIST_LEVEL
 #define RT_TIMER_SKIP_LIST_LEVEL          1