diff --git a/src/irq.c b/src/irq.c
index 491f97f4a8..de36868d87 100644
--- a/src/irq.c
+++ b/src/irq.c
@@ -35,14 +35,14 @@ volatile rt_uint8_t rt_interrupt_nest;
  */
 void rt_interrupt_enter(void)
 {
-	rt_base_t level;
+    rt_base_t level;
 
-	RT_DEBUG_LOG(RT_DEBUG_IRQ, ("irq coming..., irq nest:%d\n",
+    RT_DEBUG_LOG(RT_DEBUG_IRQ, ("irq coming..., irq nest:%d\n",
                                 rt_interrupt_nest));
 
-	level = rt_hw_interrupt_disable();
-	rt_interrupt_nest ++;
-	rt_hw_interrupt_enable(level);
+    level = rt_hw_interrupt_disable();
+    rt_interrupt_nest ++;
+    rt_hw_interrupt_enable(level);
 }
 RTM_EXPORT(rt_interrupt_enter);
 
@@ -55,13 +55,14 @@ RTM_EXPORT(rt_interrupt_enter);
  */
 void rt_interrupt_leave(void)
 {
-	rt_base_t level;
+    rt_base_t level;
 
-	RT_DEBUG_LOG(RT_DEBUG_IRQ, ("irq leave, irq nest:%d\n", rt_interrupt_nest));
+    RT_DEBUG_LOG(RT_DEBUG_IRQ, ("irq leave, irq nest:%d\n",
+                                rt_interrupt_nest));
 
-	level = rt_hw_interrupt_disable();
-	rt_interrupt_nest --;
-	rt_hw_interrupt_enable(level);
+    level = rt_hw_interrupt_disable();
+    rt_interrupt_nest --;
+    rt_hw_interrupt_enable(level);
 }
 RTM_EXPORT(rt_interrupt_leave);
 
@@ -75,7 +76,7 @@ RTM_EXPORT(rt_interrupt_leave);
  */
 rt_uint8_t rt_interrupt_get_nest(void)
 {
-	return rt_interrupt_nest;
+    return rt_interrupt_nest;
 }
 RTM_EXPORT(rt_interrupt_get_nest);