diff --git a/scons/gallium.py b/scons/gallium.py
index a40a9571915..15aa94448c7 100644
--- a/scons/gallium.py
+++ b/scons/gallium.py
@@ -177,8 +177,11 @@ def generate(env):
             '_WINDOWS',
             #'_UNICODE',
             #'UNICODE',
-            ('_WIN32_WINNT', '0x0501'), # minimum required OS version
-            ('WINVER', '0x0501'),
+            # http://msdn.microsoft.com/en-us/library/aa383745.aspx
+            ('_WIN32_WINNT', '0x0601'),
+            ('WINVER', '0x0601'),
+            # http://msdn2.microsoft.com/en-us/library/6dwk3a1z.aspx,
+            'WIN32_LEAN_AND_MEAN',
         ]
         if msvc and env['toolchain'] != 'winddk':
             cppdefines += [