diff --git a/src/main.cpp b/src/main.cpp
index 2a91c62..6aaaeec 100755
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -4,6 +4,10 @@
 // Distributed under the MIT/X11 software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+#ifndef __STDC_FORMAT_MACROS
+#define __STDC_FORMAT_MACROS
+#endif
+
 #include "checkpoints.h"
 #include "db.h"
 #include "net.h"