diff --git a/include/stddef.h b/include/stddef.h
index 334267f457..a25ac8beb7 100644
--- a/include/stddef.h
+++ b/include/stddef.h
@@ -11,6 +11,10 @@ typedef __PTRDIFF_TYPE__ ptrdiff_t;
 
 typedef long unsigned int size_t;
 
+#ifndef __cplusplus
+typedef int wchar_t;
+#endif
+
 typedef struct { long long __ll; long double __ld; } max_align_t;
 
 #define offsetof(type, member) __builtin_offsetof(type, member)