diff --git a/bench/BenchSysTimer_windows.cpp b/bench/BenchSysTimer_windows.cpp
index 103d1b55c..e51d34603 100644
--- a/bench/BenchSysTimer_windows.cpp
+++ b/bench/BenchSysTimer_windows.cpp
@@ -42,7 +42,7 @@ void BenchSysTimer::startCpu() {
 
 double BenchSysTimer::endCpu() {
     ULONGLONG end_cpu = winCpuTime();
-    return (end_cpu - this->fStartCpu) / 10000;
+    return static_cast<double>((end_cpu - this->fStartCpu)) / 10000.0L;
 }
 double BenchSysTimer::endWall() {
     LARGE_INTEGER end_wall;
@@ -55,8 +55,9 @@ double BenchSysTimer::endWall() {
     
     LARGE_INTEGER frequency;
     if (0 == ::QueryPerformanceFrequency(&frequency)) {
-        return 0;
+        return 0.0L;
     } else {
-        return (double)ticks_elapsed.QuadPart / frequency.QuadPart * 1000;
+        return static_cast<double>(ticks_elapsed.QuadPart)
+            /  static_cast<double>(frequency.QuadPart * 1000);
     }
 }
diff --git a/bench/BenchSysTimer_windows.h b/bench/BenchSysTimer_windows.h
index b0f016aca..c3d0c9b9c 100644
--- a/bench/BenchSysTimer_windows.h
+++ b/bench/BenchSysTimer_windows.h
@@ -12,7 +12,7 @@
 #define WIN32_LEAN_AND_MEAN 1
 #include <Windows.h>
 
-struct BenchSysTimer {
+class BenchSysTimer {
 public:
     void startWall();
     void startCpu();