diff --git a/source/module/monitor_kernel_lib.c b/source/module/monitor_kernel_lib.c
index 47021f0..bc639d2 100644
--- a/source/module/monitor_kernel_lib.c
+++ b/source/module/monitor_kernel_lib.c
@@ -119,7 +119,8 @@ static void sample_task_work(struct work_struct *work){
     vm_record.tv = ktime_get_real();
     vm_record.threshold_num = k_watch_timer->threshold_num;
 
-    for (int i = 0; i < vm_record.threshold_num; i++) {
+    int i;
+    for (i = 0; i < vm_record.threshold_num; i++) {
       kwarg = &k_watch_timer->k_watch_args[k_watch_timer->threshold_buffer[i]];
       k_w_arg2threshold(kwarg, &vm_record.threshold_record[i]);
     }
@@ -169,7 +170,8 @@ int monitor_init(void) {
   if (ret)
     return -1;
   // init workqueue
-  for (int i=0; i < MAX_TIMER_NUM; i++) {
+  int i;
+  for (i=0; i < MAX_TIMER_NUM; i++) {
     kernel_watch_timer *kw_timer = &kernel_wtimer_list[i];
     INIT_WORK(&kw_timer->wk, sample_task_work);
   }