diff --git a/components/drivers/pic/pic.c b/components/drivers/pic/pic.c
index 66834944287..4194692fd1d 100644
--- a/components/drivers/pic/pic.c
+++ b/components/drivers/pic/pic.c
@@ -1198,7 +1198,7 @@ static int list_irq(int argc, char**argv)
             _pic_name_max, "PIC",
             12, "Mode",
         #ifdef RT_USING_SMP
-            RT_CPUS_NR, "CPUs",
+            rt_max(RT_CPUS_NR, 4), "CPUs",
         #else
             0, 0,
         #endif
@@ -1254,6 +1254,10 @@ static int list_irq(int argc, char**argv)
 
         rt_kputs(info);
     #ifdef RT_USING_SMP
+        if (RT_CPUS_NR < 4)
+        {
+            rt_memset(&cpumask[RT_CPUS_NR], ' ', 4 - RT_CPUS_NR);
+        }
         rt_kputs(cpumask);
     #endif