diff --git a/inc/rk_type.h b/inc/rk_type.h
index 72be2eb0..7b4570c6 100644
--- a/inc/rk_type.h
+++ b/inc/rk_type.h
@@ -17,6 +17,8 @@
 #ifndef __RK_TYPE_H__
 #define __RK_TYPE_H__
 
+#include <stddef.h>
+
 typedef unsigned char           RK_U8;
 typedef unsigned short          RK_U16;
 typedef unsigned int            RK_U32;
@@ -71,16 +73,6 @@ typedef enum {
 #define NULL                    0L
 #endif
 
-#ifndef _SIZE_T
-#define _SIZE_T
-typedef unsigned long           size_t;
-#endif
-
-#ifndef _SSIZE_T
-#define _SSIZE_T
-typedef long                    ssize_t;
-#endif
-
 #define RK_RET                  RK_S32
 #define RK_NULL                 0L
 #define RK_OK                   0
diff --git a/mpp/base/kmpp_obj.c b/mpp/base/kmpp_obj.c
index 34846de9..fc3d072f 100644
--- a/mpp/base/kmpp_obj.c
+++ b/mpp/base/kmpp_obj.c
@@ -25,10 +25,12 @@
 #define MPP_OBJ_DBG_SET                 (0x00000001)
 #define MPP_OBJ_DBG_GET                 (0x00000002)
 
-#define kmpp_obj_dbg(flag, fmt, ...)     _mpp_dbg(kmpp_obj_debug, flag, fmt, ## __VA_ARGS__)
+#define kmpp_obj_dbg(flag, fmt, ...)    _mpp_dbg(kmpp_obj_debug, flag, fmt, ## __VA_ARGS__)
 
-#define kmpp_obj_dbg_set(fmt, ...)       kmpp_obj_dbg(MPP_OBJ_DBG_SET, fmt, ## __VA_ARGS__)
-#define kmpp_obj_dbg_get(fmt, ...)       kmpp_obj_dbg(MPP_OBJ_DBG_GET, fmt, ## __VA_ARGS__)
+#define kmpp_obj_dbg_set(fmt, ...)      kmpp_obj_dbg(MPP_OBJ_DBG_SET, fmt, ## __VA_ARGS__)
+#define kmpp_obj_dbg_get(fmt, ...)      kmpp_obj_dbg(MPP_OBJ_DBG_GET, fmt, ## __VA_ARGS__)
+
+#define U64_TO_PTR(ptr)                 ((void *)(intptr_t)(ptr))
 
 #define ENTRY_TO_PTR(tbl, entry)        ((char *)entry + tbl->data_offset)
 #define ENTRY_TO_s32_PTR(tbl, entry)    ((rk_s32 *)ENTRY_TO_PTR(tbl, entry))
@@ -259,7 +261,7 @@ rk_s32 kmpp_objdef_init(KmppObjDef *def, const char *name)
             goto DONE;
         }
 
-        root = (void *)s.trie_root;
+        root = U64_TO_PTR(s.trie_root);
         info = mpp_trie_get_info_from_root(root, "__size");
         obj_size = info ? *(RK_S32 *)mpp_trie_info_ctx(info) : 0;
 
@@ -428,7 +430,7 @@ rk_s32 kmpp_obj_get(KmppObj *obj, KmppObjDef def)
     impl->trie = def_impl->trie;
     impl->need_free = 1;
     impl->shm = shm;
-    impl->entry = (void *)shm->kobj_uaddr;
+    impl->entry = U64_TO_PTR(shm->kobj_uaddr);
 
     *obj = impl;