diff --git a/src/bvar/detail/sampler.cpp b/src/bvar/detail/sampler.cpp
index f3462558c1..4632938bb2 100644
--- a/src/bvar/detail/sampler.cpp
+++ b/src/bvar/detail/sampler.cpp
@@ -155,7 +155,7 @@ void SamplerCollector::run() {
     butil::LinkNode<Sampler> root;
     int consecutive_nosleep = 0;
     while (!_stop) {
-        int64_t abstime = butil::cpuwide_time_ns();
+        int64_t abstime = butil::cpuwide_time_us();
         Sampler* s = this->reset();
         if (s) {
             s->InsertBeforeAsList(&root);
@@ -176,13 +176,13 @@ void SamplerCollector::run() {
             p = saved_next;
         }
         bool slept = false;
-        int64_t now = butil::cpuwide_time_ns();
+        int64_t now = butil::cpuwide_time_us();
         _cumulated_time_us += now - abstime;
         abstime += 1000000L;
         while (abstime > now) {
             ::usleep(abstime - now);
             slept = true;
-            now = butil::cpuwide_time_ns();
+            now = butil::cpuwide_time_us();
         }
         if (slept) {
             consecutive_nosleep = 0;