diff --git a/include/SDL_platform.h b/include/SDL_platform.h
index b4e7b7f2f..1516da38c 100644
--- a/include/SDL_platform.h
+++ b/include/SDL_platform.h
@@ -87,6 +87,9 @@
 #ifndef TARGET_OS_TV
 #define TARGET_OS_TV 0
 #endif
+#ifndef TARGET_OS_SIMULATOR
+#define TARGET_OS_SIMULATOR 0
+#endif
 
 #if TARGET_OS_TV
 #undef __TVOS__