diff --git a/bsp/tm4c129x/applications/board.c b/bsp/tm4c129x/applications/board.c
index 0da547e8674d942548080d2c76c6e798c02892e1..382cf28cf8b1191ca740a6fae4e2e6955b3bed67 100644
--- a/bsp/tm4c129x/applications/board.c
+++ b/bsp/tm4c129x/applications/board.c
@@ -55,12 +55,16 @@ extern void PendSV_Handler(void);
 extern void HardFault_Handler(void);
 
 /**
- * This function will initial LPC40xx board.
+ * This function will initial TM4C129X board.
  */
 void rt_hw_board_init()
 {
     //init low level drivers. e.g. cpu uart etc.
     rt_components_board_init();
+    //init HEAP.
+    #ifdef RT_USING_HEAP
+        rt_system_heap_init(HEAP_BEGIN, HEAP_END);
+    #endif
     //redirect RTT stdio to CONSOLE device
     rt_console_set_device(RT_CONSOLE_DEVICE_NAME);
 }
diff --git a/bsp/tm4c129x/applications/board.h b/bsp/tm4c129x/applications/board.h
index 8103d0b1f198bd148c5cffc44e69f31e6b3e48f2..20b038db3061b9d8c86ba46f59ea7decdc880a88 100644
--- a/bsp/tm4c129x/applications/board.h
+++ b/bsp/tm4c129x/applications/board.h
@@ -33,7 +33,7 @@ extern int Image$$RW_IRAM$$ZI$$Limit;
 extern int _ebss;
 #define HEAP_BEGIN  ((void *)&_ebss)
 #endif
-#define HEAP_END    (0x20000000 + 256*1024)
+#define HEAP_END    ((void *)(0x20000000 + 256*1024))
 
 #define FINSH_DEVICE_NAME   RT_CONSOLE_DEVICE_NAME
 void rt_hw_board_init(void);