diff --git a/src/bench/bench.cpp b/src/bench/bench.cpp
index 6de4802c146dd..5576a53c99892 100644
--- a/src/bench/bench.cpp
+++ b/src/bench/bench.cpp
@@ -56,13 +56,13 @@ bool benchmark::State::KeepRunning()
     else {
         now = gettimedouble();
         double elapsed = now - lastTime;
-        double elapsedOne = elapsed * countMaskInv;
+        double elapsedOne = elapsed / (countMask + 1);
         if (elapsedOne < minTime) minTime = elapsedOne;
         if (elapsedOne > maxTime) maxTime = elapsedOne;
 
         // We only use relative values, so don't have to handle 64-bit wrap-around specially
         nowCycles = perf_cpucycles();
-        uint64_t elapsedOneCycles = (nowCycles - lastCycles) * countMaskInv;
+        uint64_t elapsedOneCycles = (nowCycles - lastCycles) / (countMask + 1);
         if (elapsedOneCycles < minCycles) minCycles = elapsedOneCycles;
         if (elapsedOneCycles > maxCycles) maxCycles = elapsedOneCycles;
 
@@ -70,7 +70,6 @@ bool benchmark::State::KeepRunning()
           // If the execution was much too fast (1/128th of maxElapsed), increase the count mask by 8x and restart timing.
           // The restart avoids including the overhead of this code in the measurement.
           countMask = ((countMask<<3)|7) & ((1LL<<60)-1);
-          countMaskInv = 1./(countMask+1);
           count = 0;
           minTime = std::numeric_limits<double>::max();
           maxTime = std::numeric_limits<double>::min();
@@ -82,7 +81,6 @@ bool benchmark::State::KeepRunning()
             uint64_t newCountMask = ((countMask<<1)|1) & ((1LL<<60)-1);
             if ((count & newCountMask)==0) {
                 countMask = newCountMask;
-                countMaskInv = 1./(countMask+1);
             }
         }
     }
diff --git a/src/bench/bench.h b/src/bench/bench.h
index 6b1fae9a638fa..4eb5b79018add 100644
--- a/src/bench/bench.h
+++ b/src/bench/bench.h
@@ -39,7 +39,7 @@ namespace benchmark {
         std::string name;
         double maxElapsed;
         double beginTime;
-        double lastTime, minTime, maxTime, countMaskInv;
+        double lastTime, minTime, maxTime;
         uint64_t count;
         uint64_t countMask;
         uint64_t beginCycles;
@@ -53,7 +53,6 @@ namespace benchmark {
             minCycles = std::numeric_limits<uint64_t>::max();
             maxCycles = std::numeric_limits<uint64_t>::min();
             countMask = 1;
-            countMaskInv = 1./(countMask + 1);
         }
         bool KeepRunning();
     };