diff --git a/include/SDL_platform.h b/include/SDL_platform.h
index 6e67b4577a..e8bf11acfd 100644
--- a/include/SDL_platform.h
+++ b/include/SDL_platform.h
@@ -199,8 +199,10 @@
 #undef __GDK__
 #define __GDK__ 1
 #endif
-#if defined(__PSP__)
+#if defined(__PSP__) || defined(__psp__)
+#ifdef __PSP__
 #undef __PSP__
+#endif
 #define __PSP__ 1
 #endif
 #if defined(PS2)