diff --git a/src/irq.c b/src/irq.c
index 78ad58606482ba66bf9390ac52b28f4273ed2a1b..311d297bfe7760e56e3b1051d0c19311c61a732b 100644
--- a/src/irq.c
+++ b/src/irq.c
@@ -105,7 +105,7 @@ RTM_EXPORT(rt_interrupt_leave);
  *
  * @return the number of nested interrupts.
  */
-rt_uint8_t rt_interrupt_get_nest(void)
+RT_WEAK rt_uint8_t rt_interrupt_get_nest(void)
 {
     rt_uint8_t ret;
     rt_base_t level;