diff --git a/cpp/velox/compute/WholeStageResultIterator.cc b/cpp/velox/compute/WholeStageResultIterator.cc
index faae3aeffbd..1766654f3d9 100644
--- a/cpp/velox/compute/WholeStageResultIterator.cc
+++ b/cpp/velox/compute/WholeStageResultIterator.cc
@@ -54,6 +54,7 @@ const std::string kRamReadBytes = "ramReadBytes";
 const std::string kPreloadSplits = "readyPreloadedSplits";
 const std::string kPageLoadTime = "pageLoadTimeNs";
 const std::string kDataSourceAddSplitWallNanos = "dataSourceAddSplitWallNanos";
+const std::string kWaitForPreloadSplitNanos = "waitForPreloadSplitNanos";
 const std::string kDataSourceReadWallNanos = "dataSourceReadWallNanos";
 const std::string kNumWrittenFiles = "numWrittenFiles";
 const std::string kWriteIOTime = "writeIOWallNanos";
@@ -478,7 +479,8 @@ void WholeStageResultIterator::collectMetrics() {
           runtimeMetric("sum", entry.second->customStats, kPreloadSplits);
       metrics_->get(Metrics::kPageLoadTime)[metricIndex] = runtimeMetric("sum", second->customStats, kPageLoadTime);
       metrics_->get(Metrics::kDataSourceAddSplitWallNanos)[metricIndex] =
-          runtimeMetric("sum", second->customStats, kDataSourceAddSplitWallNanos);
+          runtimeMetric("sum", second->customStats, kDataSourceAddSplitWallNanos) +
+          runtimeMetric("sum", second->customStats, kWaitForPreloadSplitNanos);
       metrics_->get(Metrics::kDataSourceReadWallNanos)[metricIndex] =
           runtimeMetric("sum", second->customStats, kDataSourceReadWallNanos);
       metrics_->get(Metrics::kNumWrittenFiles)[metricIndex] =