diff --git a/scripts/src/osd/sdl_cfg.lua b/scripts/src/osd/sdl_cfg.lua
index 75f294a78b6..10dde2d511e 100644
--- a/scripts/src/osd/sdl_cfg.lua
+++ b/scripts/src/osd/sdl_cfg.lua
@@ -139,7 +139,7 @@ if _OPTIONS["targetos"]=="windows" then
 		defines {
 			"UNICODE",
 			"_UNICODE",
-			"_WIN32_WINNT=0x0501",
+			"_WIN32_WINNT=0x0600",
 			"WIN32_LEAN_AND_MEAN",
 			"NOMINMAX",
 		}
diff --git a/scripts/src/osd/windows_cfg.lua b/scripts/src/osd/windows_cfg.lua
index 85b0cd810f3..9389c4ecca1 100644
--- a/scripts/src/osd/windows_cfg.lua
+++ b/scripts/src/osd/windows_cfg.lua
@@ -3,16 +3,12 @@
 
 defines {
 	"OSD_WINDOWS",
+	"UNICODE",
+	"_UNICODE"
 	"WIN32_LEAN_AND_MEAN",
 	"NOMINMAX",
 }
 
-configuration { "mingw* or vs*" }
-	defines {
-		"UNICODE",
-		"_UNICODE"
-	}
-
 configuration { "vs*" }
 	flags {
 		"Unicode",
diff --git a/src/osd/asio.h b/src/osd/asio.h
index d59a90b8929..0643bf332b4 100644
--- a/src/osd/asio.h
+++ b/src/osd/asio.h
@@ -18,18 +18,12 @@
 #endif
 
 #if defined(_WIN32) && !defined(_WIN32_WINNT)
-#if defined(OSD_WINDOWS)
-#define _WIN32_WINNT 0x0501
-#else
-#define _WIN32_WINNT 0x0603
-#endif
+#define _WIN32_WINNT 0x0600
 #endif
+
 #define ASIO_HEADER_ONLY
 #define ASIO_STANDALONE
 #define ASIO_SEPARATE_COMPILATION
-#define ASIO_NOEXCEPT noexcept(true)
-#define ASIO_NOEXCEPT_OR_NOTHROW noexcept(true)
-#define ASIO_ERROR_CATEGORY_NOEXCEPT noexcept(true)
 
 #include <asio.hpp>
 #undef interface