diff --git a/configure.ac b/configure.ac
index 4e105629e..1b3d91890 100644
--- a/configure.ac
+++ b/configure.ac
@@ -221,7 +221,7 @@ case $host in
        AC_MSG_ERROR("windres not found")
      fi
 
-     CPPFLAGS="$CPPFLAGS -D_MT -DWIN32 -D_WINDOWS -DBOOST_THREAD_USE_LIB"
+     CPPFLAGS="$CPPFLAGS -D_MT -DWIN32 -D_WINDOWS -DBOOST_THREAD_USE_LIB -D__USE_MINGW_ANSI_STDIO"
      LEVELDB_TARGET_FLAGS="TARGET_OS=OS_WINDOWS_CROSSCOMPILE"
      CXXFLAGS="$CXXFLAGS -w"
      ;;
diff --git a/src/test/util_tests.cpp b/src/test/util_tests.cpp
index 6a9a787fa..b57945d06 100644
--- a/src/test/util_tests.cpp
+++ b/src/test/util_tests.cpp
@@ -303,4 +303,31 @@ BOOST_AUTO_TEST_CASE(util_TimingResistantEqual)
     BOOST_CHECK(!TimingResistantEqual(std::string("abc"), std::string("aba")));
 }
 
+/* Test strprintf formatting directives.
+ * Put a string before and after to ensure sanity of element sizes on stack. */
+#define B "check_prefix"
+#define E "check_postfix"
+BOOST_AUTO_TEST_CASE(strprintf_numbers)
+{
+    int64_t s64t = -9223372036854775807LL; /* signed 64 bit test value */
+    uint64_t u64t = 18446744073709551615ULL; /* unsigned 64 bit test value */
+    BOOST_CHECK(strprintf("%s %"PRId64" %s", B, s64t, E) == B" -9223372036854775807 "E);
+    BOOST_CHECK(strprintf("%s %"PRIu64" %s", B, u64t, E) == B" 18446744073709551615 "E);
+    BOOST_CHECK(strprintf("%s %"PRIx64" %s", B, u64t, E) == B" ffffffffffffffff "E);
+
+    size_t st = 12345678; /* unsigned size_t test value */
+    ssize_t sst = -12345678; /* signed size_t test value */
+    BOOST_CHECK(strprintf("%s %"PRIszd" %s", B, sst, E) == B" -12345678 "E);
+    BOOST_CHECK(strprintf("%s %"PRIszu" %s", B, st, E) == B" 12345678 "E);
+    BOOST_CHECK(strprintf("%s %"PRIszx" %s", B, st, E) == B" bc614e "E);
+
+    ptrdiff_t pt = 87654321; /* positive ptrdiff_t test value */
+    ptrdiff_t spt = -87654321; /* negative ptrdiff_t test value */
+    BOOST_CHECK(strprintf("%s %"PRIpdd" %s", B, spt, E) == B" -87654321 "E);
+    BOOST_CHECK(strprintf("%s %"PRIpdu" %s", B, pt, E) == B" 87654321 "E);
+    BOOST_CHECK(strprintf("%s %"PRIpdx" %s", B, pt, E) == B" 5397fb1 "E);
+}
+#undef B
+#undef E
+
 BOOST_AUTO_TEST_SUITE_END()
diff --git a/src/util.cpp b/src/util.cpp
index 5411bb2fe..44186b732 100644
--- a/src/util.cpp
+++ b/src/util.cpp
@@ -336,11 +336,7 @@ string vstrprintf(const char *format, va_list ap)
     {
         va_list arg_ptr;
         va_copy(arg_ptr, ap);
-#ifdef WIN32
-        ret = _vsnprintf(p, limit, format, arg_ptr);
-#else
         ret = vsnprintf(p, limit, format, arg_ptr);
-#endif
         va_end(arg_ptr);
         if (ret >= 0 && ret < limit)
             break;
diff --git a/src/util.h b/src/util.h
index d3687620d..9c7f185f1 100644
--- a/src/util.h
+++ b/src/util.h
@@ -44,26 +44,13 @@ 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 */
-#if defined(_MSC_VER) || defined(__MSVCRT__)
-  /* (s)size_t and ptrdiff_t have the same size specifier in MSVC:
-     http://msdn.microsoft.com/en-us/library/tcxf1dw6%28v=vs.100%29.aspx
-   */
-  #define PRIszx    "Ix"
-  #define PRIszu    "Iu"
-  #define PRIszd    "Id"
-  #define PRIpdx    "Ix"
-  #define PRIpdu    "Iu"
-  #define PRIpdd    "Id"
-#else /* C99 standard */
-  #define PRIszx    "zx"
-  #define PRIszu    "zu"
-  #define PRIszd    "zd"
-  #define PRIpdx    "tx"
-  #define PRIpdu    "tu"
-  #define PRIpdd    "td"
-#endif
-
+/* 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"
 
 // 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>
@@ -117,7 +104,7 @@ inline void MilliSleep(int64_t n)
  * Parameters count from 1.
  */
 #ifdef __GNUC__
-#define ATTR_WARN_PRINTF(X,Y) __attribute__((format(printf,X,Y)))
+#define ATTR_WARN_PRINTF(X,Y) __attribute__((format(gnu_printf,X,Y)))
 #else
 #define ATTR_WARN_PRINTF(X,Y)
 #endif