diff --git a/FreeRTOS/Demo/CORTEX_M3_MPS2_QEMU_GCC/init/startup.c b/FreeRTOS/Demo/CORTEX_M3_MPS2_QEMU_GCC/init/startup.c
index f620d9f2..0c8ea57a 100644
--- a/FreeRTOS/Demo/CORTEX_M3_MPS2_QEMU_GCC/init/startup.c
+++ b/FreeRTOS/Demo/CORTEX_M3_MPS2_QEMU_GCC/init/startup.c
@@ -36,7 +36,7 @@ extern void xPortPendSVHandler( void );
 extern void xPortSysTickHandler( void );
 extern void uart_init();
 extern int main();
-// extern void isr_starter( void );    // main_tmr.c
+extern void isr_starter( void );    // main_tmr.c
 
 void __attribute__( ( weak ) ) EthernetISR( void );
 
@@ -177,8 +177,7 @@ const uint32_t * isr_vector[] __attribute__( ( section( ".isr_vector" ) ) ) =
     0,                                   /* reserved */
     ( uint32_t * ) &xPortPendSVHandler,  /* PendSV handler    -2 */
     ( uint32_t * ) &xPortSysTickHandler, /* SysTick_Handler   -1 */
-    // ( uint32_t * ) &isr_starter,       /* uart0 receive 0 */
-    0,
+    ( uint32_t * ) &isr_starter,       /* uart0 receive 0 */
     0,                                   /* uart0 transmit */
     0,                                   /* uart1 receive */
     0,                                   /* uart1 transmit */