diff --git a/src/util.h b/src/util.h
index c667431ca..c28380a59 100644
--- a/src/util.h
+++ b/src/util.h
@@ -44,15 +44,10 @@ static const int64_t CENT = 1000000;
 #define UEND(a)             ((unsigned char*)&((&(a))[1]))
 #define ARRAYLEN(array)     (sizeof(array)/sizeof((array)[0]))
 
-/* Format characters for (s)size_t, ptrdiff_t, uint64_t.
+/* Format characters for (s)size_t, ptrdiff_t.
  *
- * As the tinyformat-based formatting system is type-safe, no special format
- * characters are really needed to specify sizes. Tinyformat can support
- * (ignores) the C99 prefixes such as "ll" but chokes on MSVC's inttypes
- * defines prefixes such as "I64X".  So don't include inttypes.h and define our
- * own for compatibility.
- * If you get a warning here about a redefine of PRI?64, make sure that
- * inttypes.h is not included.
+ * Define these as empty as the tinyformat-based formatting system is
+ * type-safe, no special format characters are needed to specify sizes.
  */
 #define PRIszx    "x"
 #define PRIszu    "u"
@@ -60,9 +55,6 @@ static const int64_t CENT = 1000000;
 #define PRIpdx    "x"
 #define PRIpdu    "u"
 #define PRIpdd    "d"
-#define PRIx64    "x"
-#define PRIu64    "u"
-#define PRId64    "d"
 
 // This is needed because the foreach macro can't get over the comma in pair<t1, t2>
 #define PAIRTYPE(t1, t2)    std::pair<t1, t2>