diff --git a/include/private/vkd3d_threads.h b/include/private/vkd3d_threads.h
index 2fb82d27..a482c68d 100644
--- a/include/private/vkd3d_threads.h
+++ b/include/private/vkd3d_threads.h
@@ -21,7 +21,7 @@
 
 #include "vkd3d_memory.h"
 
-#if defined(_MSC_VER)
+#if defined(_WIN32)
 
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
diff --git a/meson.build b/meson.build
index c126945f..0f8ee67f 100644
--- a/meson.build
+++ b/meson.build
@@ -22,6 +22,10 @@ add_project_arguments('-DHAVE_DXIL_SPV', language : 'c')
 add_project_arguments('-D_GNU_SOURCE',   language : 'c')
 add_project_arguments('-DPACKAGE_VERSION="' + meson.project_version() + '"',   language : 'c')
 
+if vkd3d_platform == 'windows'
+  add_project_arguments('-D_WIN32_WINNT=0x600', language : 'c')
+endif
+
 if enable_standalone_d3d12
   add_project_arguments('-DVKD3D_BUILD_STANDALONE_D3D12', language : 'c')
 endif