diff --git a/3rdparty/sdl3-shim/SDL3/SDL.h b/3rdparty/sdl3-shim/SDL3/SDL.h
index fb16f4a3..8d0ea7c6 100644
--- a/3rdparty/sdl3-shim/SDL3/SDL.h
+++ b/3rdparty/sdl3-shim/SDL3/SDL.h
@@ -20,6 +20,7 @@
 #include "SDL_pixels.h"
 #include "SDL_surface.h"
 #include "SDL_timer.h"
+#include "SDL_platform_defines.h"
 
 #include <random>
 
diff --git a/3rdparty/sdl3-shim/SDL3/SDL_platform_defines.h b/3rdparty/sdl3-shim/SDL3/SDL_platform_defines.h
new file mode 100644
index 00000000..8d0574e4
--- /dev/null
+++ b/3rdparty/sdl3-shim/SDL3/SDL_platform_defines.h
@@ -0,0 +1,43 @@
+#pragma once
+
+#include <SDL2/SDL_platform.h>
+
+// https://wiki.libsdl.org/SDL3/README-migration#sdl_platformh
+
+// #define SDL_PLATFORM_3DS __3DS__
+// #define SDL_PLATFORM_AIX __AIX__
+// #define SDL_PLATFORM_ANDROID __ANDROID__
+// #define SDL_PLATFORM_APPLE __APPLE__
+// #define SDL_PLATFORM_BSDI __BSDI__
+#ifdef __CYGWIN__
+#define SDL_PLATFORM_CYGWIN 1
+#endif
+// #define SDL_PLATFORM_EMSCRIPTEN __EMSCRIPTEN__
+// #define SDL_PLATFORM_FREEBSD __FREEBSD__
+// #define SDL_PLATFORM_GDK __GDK__
+// #define SDL_PLATFORM_HAIKU __HAIKU__
+// #define SDL_PLATFORM_HPUX __HPUX__
+// #define SDL_PLATFORM_IOS __IPHONEOS__
+// #define SDL_PLATFORM_IRIX __IRIX__
+// #define SDL_PLATFORM_LINUX __LINUX__
+// #define SDL_PLATFORM_MACOS __MACOSX__
+// #define SDL_PLATFORM_NETBSD __NETBSD__
+// #define SDL_PLATFORM_OPENBSD __OPENBSD__
+// #define SDL_PLATFORM_OS2 __OS2__
+// #define SDL_PLATFORM_OSF __OSF__
+// #define SDL_PLATFORM_PS2 __PS2__
+// #define SDL_PLATFORM_PSP __PSP__
+// #define SDL_PLATFORM_QNXNTO __QNXNTO__
+// #define SDL_PLATFORM_RISCOS __RISCOS__
+// #define SDL_PLATFORM_SOLARIS __SOLARIS__
+// #define SDL_PLATFORM_TVOS __TVOS__
+// #define SDL_PLATFORM_UNI __unix__
+// #define SDL_PLATFORM_VITA __VITA__
+// #define SDL_PLATFORM_WIN32 __WIN32__
+// #define SDL_PLATFORM_WINGDK __WINGDK__
+// #define SDL_PLATFORM_XBOXONE __XBOXONE__
+// #define SDL_PLATFORM_XBOXSERIES __XBOXSERIES__
+
+#if defined(_WIN32) || defined(SDL_PLATFORM_CYGWIN)
+#define SDL_PLATFORM_WINDOWS 1
+#endif