diff --git a/libc/include/inttypes.h b/libc/include/inttypes.h
index 75802b3f..c2d9bcf7 100644
--- a/libc/include/inttypes.h
+++ b/libc/include/inttypes.h
@@ -1,6 +1,6 @@
 /*******************************************************************************
 
-    Copyright(C) Jonas 'Sortie' Termansen 2012, 2013.
+    Copyright(C) Jonas 'Sortie' Termansen 2012, 2013, 2014.
 
     This file is part of the Sortix C Library.
 
@@ -31,6 +31,8 @@
 
 #include <stdint.h>
 
+#if __USE_SORTIX || defined(__STDC_FORMAT_MACROS) || !defined(__cplusplus)
+
 #define PRId8 __PRId8
 #define PRIi8 __PRIi8
 #define PRIo8 __PRIo8
@@ -199,6 +201,8 @@
 #define SCNuMAX __SCNuMAX
 #define SCNxMAX __SCNxMAX
 
+#endif
+
 __BEGIN_DECLS
 
 #ifndef __wchar_t_defined