Use int64_t for 64bit ints
resolves #509
diff --git a/include/json/config.h b/include/json/config.h
index 085bdc0..6519101 100644
--- a/include/json/config.h
+++ b/include/json/config.h
@@ -152,8 +152,8 @@
typedef __int64 Int64;
typedef unsigned __int64 UInt64;
#else // if defined(_MSC_VER) // Other platforms, use long long
-typedef long long int Int64;
-typedef unsigned long long int UInt64;
+typedef int64_t Int64;
+typedef uint64_t UInt64;
#endif // if defined(_MSC_VER)
typedef Int64 LargestInt;
typedef UInt64 LargestUInt;