diff --git a/client/proxmark3.h b/client/proxmark3.h
index a634fd681..d8b34a086 100644
--- a/client/proxmark3.h
+++ b/client/proxmark3.h
@@ -12,10 +12,11 @@
 #ifndef PROXMARK3_H__
 #define PROXMARK3_H__
 
-#define __STDC_FORMAT_MACROS
+#define __STDC_FORMAT_MACROS 1
 #include <inttypes.h>
 #define llx PRIx64
 #define lli PRIi64
+#define llu PRIu64
 #define hhu PRIu8
 
 #include "usb_cmd.h"