diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 9e4004b08f559222641fdd2067eaeee06a3aeef9..f9dff652dcbdb01854ad8478c2218acc5caaf2ae 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -241,7 +241,7 @@ static int process_read_event(struct perf_tool *tool,
 		const char *name = evsel ? perf_evsel__name(evsel) : "unknown";
 		int err = perf_read_values_add_value(&rep->show_threads_values,
 					   event->read.pid, event->read.tid,
-					   event->read.id,
+					   evsel->idx,
 					   name,
 					   event->read.value);
 
diff --git a/tools/perf/util/values.c b/tools/perf/util/values.c
index 3b56aeaa8cbb5ceba357a4baa99c1446b186500e..8a32bb0095e5e61616319c4145124948f9bfb21c 100644
--- a/tools/perf/util/values.c
+++ b/tools/perf/util/values.c
@@ -192,7 +192,7 @@ int perf_read_values_add_value(struct perf_read_values *values,
 	if (cindex < 0)
 		return cindex;
 
-	values->value[tindex][cindex] = value;
+	values->value[tindex][cindex] += value;
 	return 0;
 }