diff --git a/Engine/source/platform/platformIntrinsics.h b/Engine/source/platform/platformIntrinsics.h
index b63a987be..c480242a2 100644
--- a/Engine/source/platform/platformIntrinsics.h
+++ b/Engine/source/platform/platformIntrinsics.h
@@ -40,7 +40,7 @@
 template< typename T >
 inline bool dCompareAndSwap( T* volatile& refPtr, T* oldPtr, T* newPtr )
 {
-   return dCompareAndSwap( *reinterpret_cast< volatile size_t* >( &refPtr ), ( size_t ) oldPtr, ( size_t ) newPtr );
+   return dCompareAndSwap( *reinterpret_cast< volatile uintptr_t* >( &refPtr ), ( uintptr_t ) oldPtr, ( uintptr_t ) newPtr );
 }
 
 // Test-And-Set
diff --git a/Engine/source/platform/typetraits.h b/Engine/source/platform/typetraits.h
index 4183a3f8f..658fdaa83 100644
--- a/Engine/source/platform/typetraits.h
+++ b/Engine/source/platform/typetraits.h
@@ -222,11 +222,11 @@ struct _TypeTraits< T* >
    typedef _DestructPtr Destruct;
 
    template< typename A >
-   static bool isTaggedPtr( A* ptr ) { return ( size_t( ptr ) & 0x1 ); } //TODO: 64bits
+   static bool isTaggedPtr( A* ptr ) { return ( uintptr_t( ptr ) & 0x1 ); }
    template< typename A >
-   static A* getTaggedPtr( A* ptr ) { return ( A* ) ( size_t( ptr ) | 0x1 ); } //TODO: 64bits
+   static A* getTaggedPtr( A* ptr ) { return ( A* ) ( uintptr_t( ptr ) | 0x1 ); }
    template< typename A >
-   static A* getUntaggedPtr( A* ptr ) { return ( A* ) ( size_t( ptr ) & (~0x1) ); } //TODO: 64bit
+   static A* getUntaggedPtr( A* ptr ) { return ( A* ) ( uintptr_t( ptr ) & (~0x1) ); }
 };
 
 template< typename T >
diff --git a/Engine/source/windowManager/win32/win32WindowMgr.cpp b/Engine/source/windowManager/win32/win32WindowMgr.cpp
index 4782904ec..fcb25fc59 100644
--- a/Engine/source/windowManager/win32/win32WindowMgr.cpp
+++ b/Engine/source/windowManager/win32/win32WindowMgr.cpp
@@ -138,7 +138,7 @@ void Win32WindowManager::buildMonitorsList()
    mMonitors.clear();
 
    // Enumerate all monitors
-   EnumDisplayMonitors(NULL, NULL, MonitorEnumProc, (size_t)(void*)&mMonitors);
+   EnumDisplayMonitors(NULL, NULL, MonitorEnumProc, (uintptr_t)&mMonitors);
 }
 
 S32 Win32WindowManager::findFirstMatchingMonitor(const char* name)