diff --git a/components/rtgui/include/rtgui/tree.h b/components/rtgui/include/rtgui/tree.h
index 88683ca93dce2f98aa7b11fec9beb8680b8dd6c7..b45668c562ffe7689c0d1b63f6c743bd832907aa 100644
--- a/components/rtgui/include/rtgui/tree.h
+++ b/components/rtgui/include/rtgui/tree.h
@@ -29,9 +29,9 @@
 
 #ifndef	_SYS_TREE_H_
 #define	_SYS_TREE_H_
-
-#ifndef NULL
-#define NULL RT_NULL
+
+#ifndef NULL
+#define NULL RT_NULL
 #endif
 // #include <sys/cdefs.h>
 
@@ -126,7 +126,7 @@ struct type *name##_SPLAY_INSERT(struct name *, struct type *);		\
 struct type *name##_SPLAY_REMOVE(struct name *, struct type *);		\
 									\
 /* Finds the node with the same key as elm */				\
-static __inline struct type *						\
+rt_inline struct type *						\
 name##_SPLAY_FIND(struct name *head, struct type *elm)			\
 {									\
 	if (SPLAY_EMPTY(head))						\
@@ -137,7 +137,7 @@ name##_SPLAY_FIND(struct name *head, struct type *elm)			\
 	return (NULL);							\
 }									\
 									\
-static __inline struct type *						\
+rt_inline struct type *						\
 name##_SPLAY_NEXT(struct name *head, struct type *elm)			\
 {									\
 	name##_SPLAY(head, elm);					\
@@ -151,7 +151,7 @@ name##_SPLAY_NEXT(struct name *head, struct type *elm)			\
 	return (elm);							\
 }									\
 									\
-static __inline struct type *						\
+rt_inline struct type *						\
 name##_SPLAY_MIN_MAX(struct name *head, int val)			\
 {									\
 	name##_SPLAY_MINMAX(head, val);					\