diff --git a/src/libqof/qof/gnc-int128.hpp b/src/libqof/qof/gnc-int128.hpp
index da7f2b474d..47cf69abce 100644
--- a/src/libqof/qof/gnc-int128.hpp
+++ b/src/libqof/qof/gnc-int128.hpp
@@ -27,9 +27,11 @@
 
 extern "C"
 {
+#ifndef __STDC_LIMIT_MACROS
 #define  __STDC_LIMIT_MACROS 1
 #define  __STDC_CONSTANT_MACROS 1
 #define  __STDC_FORMAT_MACROS 1
+#endif
 #include <inttypes.h>
 }