diff --git a/luigi/lock.py b/luigi/lock.py
index d26a82c517..1b31ed0c90 100644
--- a/luigi/lock.py
+++ b/luigi/lock.py
@@ -37,7 +37,7 @@ def getpcmd(pid):
     """
     if os.name == "nt":
         # Use wmic command instead of ps on Windows.
-        cmd = 'wmic path win32_process where ProcessID=%s get Commandline' % (pid, )
+        cmd = 'wmic path win32_process where ProcessID=%s get Commandline 2> nul' % (pid, )
         with os.popen(cmd, 'r') as p:
             lines = [line for line in p.readlines() if line.strip("\r\n ") != ""]
             if lines:
diff --git a/test/lock_test.py b/test/lock_test.py
index 54930a1ca1..7ef8761cc1 100644
--- a/test/lock_test.py
+++ b/test/lock_test.py
@@ -31,11 +31,18 @@
 class TestCmd(unittest.TestCase):
 
     def test_getpcmd(self):
-        p = subprocess.Popen(["sleep", "1"])
+        if os.name == 'nt':
+            command = ["ping", "1.1.1.1", "-w", "1000"]
+        else:
+            command = ["sleep", "1"]
+
+        external_process = subprocess.Popen(command)
+        result = luigi.lock.getpcmd(external_process.pid)
+
         self.assertTrue(
-            luigi.lock.getpcmd(p.pid) in ["sleep 1", '[sleep]']
+            result.strip() in ["sleep 1", '[sleep]', 'ping 1.1.1.1 -w 1000']
         )
-        p.kill()
+        external_process.kill()
 
 
 class LockTest(unittest.TestCase):