diff --git a/src/benchmark_runner.cc b/src/benchmark_runner.cc
index cb8dbc8e3e..84d5dfc5e2 100644
--- a/src/benchmark_runner.cc
+++ b/src/benchmark_runner.cc
@@ -371,9 +371,7 @@ double BenchmarkRunner::GetMinTimeToApply() const {
 }
 
 double BenchmarkRunner::GetRelAccuracy(const IterationResults& i) const {
-  return std::sqrt(i.seconds_pow2 / i.iters -
-                   std::pow(i.seconds / i.iters, 2.)) /
-         (i.seconds / i.iters) / sqrt(i.iters);
+  return std::sqrt(it_res.seconds_pow2 - std::pow(i.seconds, 2.) / static_cast<double>(i.iters)) / i.seconds;
 }
 
 bool BenchmarkRunner::HasSufficientTimeToApply(