1 files changed, 1 insertions, 1 deletions
diff --git a/src/irq.c b/src/irq.c
index ee03204819..78ad586064 100644
--- a/src/irq.c
+++ b/src/irq.c
@@ -52,7 +52,7 @@ void rt_interrupt_leave_sethook(void (*hook)(void))
 #ifdef RT_USING_SMP
 #define rt_interrupt_nest rt_cpu_self()->irq_nest
 #else
-volatile rt_uint8_t rt_interrupt_nest;
+volatile rt_uint8_t rt_interrupt_nest = 0;
 #endif
 
 /**