1 files changed, 1 insertions, 3 deletions
diff --git a/setup.py b/setup.py
index 12882413ce..90c9316b0d 100644
--- a/setup.py
+++ b/setup.py
@@ -110,8 +110,6 @@ if EXTRA_ENV_COMPILE_ARGS is None:
       EXTRA_ENV_COMPILE_ARGS += ' -D_ftime=_ftime32 -D_timeb=__timeb32 -D_ftime_s=_ftime32_s'
     else:
       EXTRA_ENV_COMPILE_ARGS += ' -D_ftime=_ftime64 -D_timeb=__timeb64'
-  elif 'win32' in sys.platform:
-    EXTRA_ENV_COMPILE_ARGS += ' -D_PYTHON_MSVC'
   elif "linux" in sys.platform:
     EXTRA_ENV_COMPILE_ARGS += ' -std=c++11 -std=gnu99 -fvisibility=hidden -fno-wrapv -fno-exceptions'
   elif "darwin" in sys.platform:
@@ -163,7 +161,7 @@ if "win32" in sys.platform:
   # TODO(zyc): Re-enble c-ares on x64 and x86 windows after fixing the
   # ares_library_init compilation issue
   DEFINE_MACROS += (('WIN32_LEAN_AND_MEAN', 1), ('CARES_STATICLIB', 1),
-                    ('GRPC_ARES', 0),)
+                    ('GRPC_ARES', 0), ('NTDDI_VERSION', 0x06000000),)
   if '64bit' in platform.architecture()[0]:
     DEFINE_MACROS += (('MS_WIN64', 1),)
   elif sys.version_info >= (3, 5):