diff --git a/Rakefile b/Rakefile
index dbed3a90dcb03..1e8960eab8648 100755
--- a/Rakefile
+++ b/Rakefile
@@ -80,7 +80,7 @@ task 'dlls' do
   grpc_config = ENV['GRPC_CONFIG'] || 'opt'
   verbose = ENV['V'] || '0'
 
-  env = 'CPPFLAGS="-D_WIN32_WINNT=0x600 -DNTDDI_VERSION=0x06000000 -DUNICODE -D_UNICODE -Wno-unused-variable -Wno-unused-result -DCARES_STATICLIB -Wno-error=conversion -Wno-incompatible-pointer-types -Wno-sign-compare -Wno-parentheses -std=c++11 -DWIN32_LEAN_AND_MEAN" '
+  env = 'CPPFLAGS="-D_WIN32_WINNT=0x600 -DUNICODE -D_UNICODE -Wno-unused-variable -Wno-unused-result -DCARES_STATICLIB -Wno-error=conversion -Wno-incompatible-pointer-types -Wno-sign-compare -Wno-parentheses" '
   env += 'LDFLAGS=-static '
   env += 'SYSTEM=MINGW32 '
   env += 'EMBED_ZLIB=true '