diff --git a/src/alert.cpp b/src/alert.cpp
index 4dd3716e8..4429ecadc 100644
--- a/src/alert.cpp
+++ b/src/alert.cpp
@@ -11,7 +11,6 @@
 #include "util.h"
 
 #include <algorithm>
-#include <inttypes.h>
 #include <map>
 
 #include <boost/algorithm/string/classification.hpp>
diff --git a/src/db.cpp b/src/db.cpp
index 592512c94..591d4ed47 100644
--- a/src/db.cpp
+++ b/src/db.cpp
@@ -10,7 +10,6 @@
 #include "protocol.h"
 #include "util.h"
 
-#include <inttypes.h>
 #include <stdint.h>
 
 #ifndef WIN32
diff --git a/src/init.cpp b/src/init.cpp
index c05ed4356..4cc04f520 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -24,7 +24,6 @@
 #include "walletdb.h"
 #endif
 
-#include <inttypes.h>
 #include <stdint.h>
 
 #ifndef WIN32
diff --git a/src/main.cpp b/src/main.cpp
index f46375aa9..4c98345d6 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -17,7 +17,6 @@
 #include "ui_interface.h"
 #include "util.h"
 
-#include <inttypes.h>
 #include <sstream>
 
 #include <boost/algorithm/string/replace.hpp>
diff --git a/src/net.h b/src/net.h
index 8995f70da..da590f89e 100644
--- a/src/net.h
+++ b/src/net.h
@@ -18,7 +18,6 @@
 #include "util.h"
 
 #include <deque>
-#include <inttypes.h>
 #include <stdint.h>
 
 #ifndef WIN32
diff --git a/src/rpcnet.cpp b/src/rpcnet.cpp
index b76434933..738b966b8 100644
--- a/src/rpcnet.cpp
+++ b/src/rpcnet.cpp
@@ -15,8 +15,6 @@
 #include "wallet.h" // for getinfo
 #endif
 
-#include <inttypes.h>
-
 #include <boost/foreach.hpp>
 #include "json/json_spirit_value.h"
 
diff --git a/src/util.h b/src/util.h
index 6f7627e09..6ef93021f 100644
--- a/src/util.h
+++ b/src/util.h
@@ -16,7 +16,6 @@
 
 #include <cstdio>
 #include <exception>
-#include <inttypes.h>
 #include <map>
 #include <stdarg.h>
 #include <stdint.h>
@@ -45,13 +44,25 @@ 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 and ptrdiff_t (C99 standard) */
-#define PRIszx    "zx"
-#define PRIszu    "zu"
-#define PRIszd    "zd"
-#define PRIpdx    "tx"
-#define PRIpdu    "tu"
-#define PRIpdd    "td"
+/* Format characters for (s)size_t, ptrdiff_t, uint64_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 PRIszx    "x"
+#define PRIszu    "u"
+#define PRIszd    "d"
+#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>
diff --git a/src/wallet.cpp b/src/wallet.cpp
index 823c96949..211909859 100644
--- a/src/wallet.cpp
+++ b/src/wallet.cpp
@@ -9,8 +9,6 @@
 #include "coincontrol.h"
 #include "net.h"
 
-#include <inttypes.h>
-
 #include <boost/algorithm/string/replace.hpp>
 #include <openssl/rand.h>
 
diff --git a/src/walletdb.cpp b/src/walletdb.cpp
index b3816a54b..b5b523740 100644
--- a/src/walletdb.cpp
+++ b/src/walletdb.cpp
@@ -11,8 +11,6 @@
 #include "sync.h"
 #include "wallet.h"
 
-#include <inttypes.h>
-
 #include <boost/filesystem.hpp>
 #include <boost/foreach.hpp>