1 files changed, 14 insertions, 0 deletions
diff --git a/py/mpconfig.h b/py/mpconfig.h
index 17c5a770c4..44095bd10b 100644
--- a/py/mpconfig.h
+++ b/py/mpconfig.h
@@ -4,6 +4,20 @@
 
 #include <mpconfigport.h>
 
+#ifndef INT_FMT
+// printf format spec to use for machine_int_t and friends
+#ifdef __LP64__
+// Archs where machine_int_t == long, long != int
+#define UINT_FMT "%lu"
+#define INT_FMT "%ld"
+#else
+// Archs where machine_int_t == int
+#define UINT_FMT "%u"
+#define INT_FMT "%d"
+#endif
+#endif //INT_FMT
+
+
 // Any options not explicitly set in mpconfigport.h will get default
 // values below.