diff --git a/Cxx11/prk_util.h b/Cxx11/prk_util.h
index 08bfe2f91..aec795d92 100644
--- a/Cxx11/prk_util.h
+++ b/Cxx11/prk_util.h
@@ -413,12 +413,13 @@ namespace prk {
     {
         const auto d = std::log10(rate);
         const int  shifts[6] = { 15, 12, 9, 6, 3, 0 };
+        const double scales[6] = { 1.e-15, 1.e-12, 1.e-9, 1.e-6, 1.e-3, 1. };
         const char prefix[6] = { 'P', 'T', 'G', 'M', 'K', ' ' };
         for ( int r=0; r<6; r++ ) {
             const auto shift = shifts[r];
             if (d > shift) {
                 std::cout << name
-                          << " Rate (" << prefix[r] << "F/s): " << std::pow(1.0,-shift) * rate
+                          << " Rate (" << prefix[r] << "F/s): " << scales[r] * rate
                           << " Avg time (s): " << time << std::endl;
                 break;
             }