diff --git a/library/include/wchar.h b/library/include/wchar.h
index ddcbbac..cacc593 100644
--- a/library/include/wchar.h
+++ b/library/include/wchar.h
@@ -43,6 +43,10 @@
 
 /****************************************************************************/
 
+#ifndef _SYS_CLIB2_STDC_H
+#include <sys/clib2_stdc.h>
+#endif /* _SYS_CLIB2_STDC_H */
+
 #ifndef _STDDEF_H
 #include <stddef.h>
 #endif /* _STDDEF_H */