diff --git a/metricsd/uploader/upload_service.cc b/metricsd/uploader/upload_service.cc
index 0dc59a4..333a7e6 100644
--- a/metricsd/uploader/upload_service.cc
+++ b/metricsd/uploader/upload_service.cc
@@ -183,6 +183,7 @@
   base::StatisticsRecorder::GetHistograms(&histograms);
 
   histogram_snapshot_manager_.PrepareDeltas(
+      histograms.begin(), histograms.end(),
       base::Histogram::kNoFlags, base::Histogram::kUmaTargetedHistogramFlag);
 
   // Gather and reset the crash counters, shared with the binder threads.