diff --git a/test/testsupport/perf_test.cc b/test/testsupport/perf_test.cc
index affd45815f..c2a2a502f9 100644
--- a/test/testsupport/perf_test.cc
+++ b/test/testsupport/perf_test.cc
@@ -55,6 +55,7 @@ class PerfResultsLogger {
                  const std::string& units,
                  const bool important) {
     std::ostringstream value_stream;
+    value_stream.precision(8);
     value_stream << value;
     PrintResultsImpl(graph_name, trace_name, value_stream.str(), units,
                      important);
@@ -74,6 +75,7 @@ class PerfResultsLogger {
                              const std::string& units,
                              const bool important) {
     std::ostringstream value_stream;
+    value_stream.precision(8);
     value_stream << '{' << mean << ',' << error << '}';
     PrintResultsImpl(graph_name, trace_name, value_stream.str(), units,
                      important);
@@ -93,6 +95,7 @@ class PerfResultsLogger {
                      const std::string& units,
                      const bool important) {
     std::ostringstream value_stream;
+    value_stream.precision(8);
     value_stream << '[';
     OutputListToStream(&value_stream, values);
     value_stream << ']';
diff --git a/test/testsupport/perf_test_unittest.cc b/test/testsupport/perf_test_unittest.cc
index f80bcf8bd3..514196b1e9 100644
--- a/test/testsupport/perf_test_unittest.cc
+++ b/test/testsupport/perf_test_unittest.cc
@@ -78,8 +78,8 @@ TEST_F(PerfTest, MAYBE_TestPrintResult) {
   expected += "RESULT measurementmodifier: trace= 42 units\n";
   PrintResult("measurement", "modifier", "trace", 42, "units", false);
 
-  expected += "*RESULT foobar: baz_v= 7 widgets\n";
-  PrintResult("foo", "bar", "baz_v", 7, "widgets", true);
+  expected += "*RESULT foobar: baz_v= 1423730 widgets\n";
+  PrintResult("foo", "bar", "baz_v", 1423730, "widgets", true);
 
   expected += "RESULT foobar: baz_me= {1,2} lemurs\n";
   PrintResultMeanAndError("foo", "bar", "baz_me", 1, 2, "lemurs", false);