diff --git a/include/rtdef.h b/include/rtdef.h
index 8e39f2f479026725c43699447142fd3da3475bf1..a0497517b11659c673e7671527b1b47cc9168ec3 100644
--- a/include/rtdef.h
+++ b/include/rtdef.h
@@ -155,6 +155,15 @@ typedef rt_base_t                       rt_off_t;       /**< Type for offset */
 #define RT_MM_PAGE_MASK                 (RT_MM_PAGE_SIZE - 1)
 #define RT_MM_PAGE_BITS                 12
 
+/* kernel malloc definitions */
+#ifndef RT_KERNEL_MALLOC
+#define RT_KERNEL_MALLOC(sz)			rt_malloc(sz)
+#endif
+
+#ifndef RT_KERNEL_FREE
+#define RT_KERNEL_FREE(ptr)				rt_free(ptr)
+#endif
+
 /**
  * @addtogroup Error
  */
diff --git a/src/idle.c b/src/idle.c
index f03b53724d9bc42a020e0ed2fb2ce0787ff3127b..eaf925e1aedbae5cdb9cd41e618ba81a349cec4a 100644
--- a/src/idle.c
+++ b/src/idle.c
@@ -128,7 +128,7 @@ void rt_thread_idle_excute(void)
         else
 #endif
         /* release thread's stack */
-        rt_free(thread->stack_addr);
+        RT_KERNEL_FREE(thread->stack_addr);
         /* delete thread object */
         rt_object_delete((rt_object_t)thread);
 #endif
diff --git a/src/ipc.c b/src/ipc.c
index 4ae821a9166d86055b40c304f44df981d221ce84..271eef9b97f378e26eca0f0a915e8cad8558dacd 100644
--- a/src/ipc.c
+++ b/src/ipc.c
@@ -1314,7 +1314,7 @@ rt_mailbox_t rt_mb_create(const char *name, rt_size_t size, rt_uint8_t flag)
 
     /* init mailbox */
     mb->size     = size;
-    mb->msg_pool = rt_malloc(mb->size * sizeof(rt_uint32_t));
+    mb->msg_pool = RT_KERNEL_MALLOC(mb->size * sizeof(rt_uint32_t));
     if (mb->msg_pool == RT_NULL)
     {
         /* delete mailbox object */
@@ -1361,7 +1361,7 @@ rt_err_t rt_mb_delete(rt_mailbox_t mb)
 #endif
 
     /* free mailbox pool */
-    rt_free(mb->msg_pool);
+    RT_KERNEL_FREE(mb->msg_pool);
 
     /* delete mailbox object */
     rt_object_delete(&(mb->parent.parent));
@@ -1827,7 +1827,7 @@ rt_mq_t rt_mq_create(const char *name,
     mq->max_msgs = max_msgs;
 
     /* allocate message pool */
-    mq->msg_pool = rt_malloc((mq->msg_size + sizeof(struct rt_mq_message))* mq->max_msgs);
+    mq->msg_pool = RT_KERNEL_MALLOC((mq->msg_size + sizeof(struct rt_mq_message))* mq->max_msgs);
     if (mq->msg_pool == RT_NULL)
     {
         rt_mq_delete(mq);
@@ -1881,7 +1881,7 @@ rt_err_t rt_mq_delete(rt_mq_t mq)
 #endif
 
     /* free message queue pool */
-    rt_free(mq->msg_pool);
+    RT_KERNEL_FREE(mq->msg_pool);
 
     /* delete message queue object */
     rt_object_delete(&(mq->parent.parent));
diff --git a/src/object.c b/src/object.c
index add84bf3becedd3cdf51e09822a8c676fbf378f0..24cfa7b9448361b3d58a11500216be0001987155 100644
--- a/src/object.c
+++ b/src/object.c
@@ -281,7 +281,7 @@ rt_object_t rt_object_allocate(enum rt_object_class_type type, const char *name)
     information = &rt_object_container[type];
 #endif
 
-    object = (struct rt_object *)rt_malloc(information->object_size);
+    object = (struct rt_object *)RT_KERNEL_MALLOC(information->object_size);
     if (object == RT_NULL)
     {
         /* no memory can be allocated */
@@ -353,7 +353,7 @@ void rt_object_delete(rt_object_t object)
 #endif
 
     /* free the memory of object */
-    rt_free(object);
+    RT_KERNEL_FREE(object);
 }
 #endif
 
diff --git a/src/thread.c b/src/thread.c
index 6a0927eb0b550aaf865248d72c1d85599507a1e2..5ab9e1b0c1d77498db17c5660f30b2707f518eb2 100644
--- a/src/thread.c
+++ b/src/thread.c
@@ -298,7 +298,7 @@ rt_thread_t rt_thread_create(const char *name,
     if (thread == RT_NULL)
         return RT_NULL;
 
-    stack_start = (void *)rt_malloc(stack_size);
+    stack_start = (void *)RT_KERNEL_MALLOC(stack_size);
     if (stack_start == RT_NULL)
     {
         /* allocate stack failure */