diff --git a/Core/src/StopWatchWin32.cpp b/Core/src/StopWatchWin32.cpp
index bace45c..6f6025c 100755
--- a/Core/src/StopWatchWin32.cpp
+++ b/Core/src/StopWatchWin32.cpp
@@ -19,12 +19,14 @@
 #include "TexCompTypes.h"
 
 #include <cassert>
+#include <Windows.h>
 
 class StopWatchImpl {
+public:
   uint64 frequency;
   uint64 start;
   uint64 stop;
-  uintptr affinityMask;
+  uintptr_t affinityMask;
 
   StopWatchImpl() :
     start(0), stop(0), affinityMask(0)
@@ -108,7 +110,7 @@ double StopWatch::TimeInSeconds() const
 {
   // Return the elapsed time in seconds.
   assert((impl->stop - impl->start) > 0);
-  return double(impl->stop - impl->start) / double(frequency);
+  return double(impl->stop - impl->start) / double(impl->frequency);
 }
 
 // Get the elapsed time in milliseconds.
@@ -116,7 +118,7 @@ double StopWatch::TimeInMilliseconds() const
 {
   // Return the elapsed time in milliseconds.
   assert((impl->stop - impl->start) > 0);
-  return double(impl->stop - impl->start) / double(frequency) * 1000.0;
+  return double(impl->stop - impl->start) / double(impl->frequency) * 1000.0;
 }
 
 // Get the elapsed time in microseconds.