diff --git a/Lib/test/test_winconsoleio.py b/Lib/test/test_winconsoleio.py
index 656483c..a78fa4d 100644
--- a/Lib/test/test_winconsoleio.py
+++ b/Lib/test/test_winconsoleio.py
@@ -121,6 +121,10 @@
             else:
                 self.assertNotIsInstance(f, ConIO)
 
+    def test_write_empty_data(self):
+        with ConIO('CONOUT$', 'w') as f:
+            self.assertEqual(f.write(b''), 0)
+
     def assertStdinRoundTrip(self, text):
         stdin = open('CONIN$', 'r')
         old_stdin = sys.stdin
diff --git a/Misc/NEWS.d/next/Windows/2018-02-19-13-54-42.bpo-31966._Q3HPb.rst b/Misc/NEWS.d/next/Windows/2018-02-19-13-54-42.bpo-31966._Q3HPb.rst
new file mode 100644
index 0000000..042a4d8
--- /dev/null
+++ b/Misc/NEWS.d/next/Windows/2018-02-19-13-54-42.bpo-31966._Q3HPb.rst
@@ -0,0 +1 @@
+Fixed WindowsConsoleIO.write() for writing empty data.
diff --git a/Modules/_io/winconsoleio.c b/Modules/_io/winconsoleio.c
index 30d1c76..b85c11b 100644
--- a/Modules/_io/winconsoleio.c
+++ b/Modules/_io/winconsoleio.c
@@ -964,6 +964,9 @@
     if (!self->writable)
         return err_mode("writing");
 
+    if (!b->len) {
+        return PyLong_FromLong(0);
+    }
     if (b->len > BUFMAX)
         len = BUFMAX;
     else