diff --git a/include/stddef.h b/include/stddef.h
index 791ba31..0033bb6 100644
--- a/include/stddef.h
+++ b/include/stddef.h
@@ -2,10 +2,8 @@
 #define _STDDEF_H
 
 typedef __SIZE_TYPE__ size_t;
-typedef __PTRDIFF_TYPE__ ssize_t;
 typedef __WCHAR_TYPE__ wchar_t;
 typedef __PTRDIFF_TYPE__ ptrdiff_t;
-typedef __PTRDIFF_TYPE__ intptr_t;
 typedef __SIZE_TYPE__ uintptr_t;
 
 #ifndef __int8_t_defined