diff --git a/dox/runner.py b/dox/runner.py
index 926db7b..70b4d50 100644
--- a/dox/runner.py
+++ b/dox/runner.py
@@ -82,8 +82,6 @@ class Runner(object):
 
     def _docker_cmd(self, *args):
         base_docker = ['docker']
-        if self.args.debug:
-            base_docker.append('-D')
         try:
             self._run_shell_command(base_docker + list(args))
         except Exception as e:
diff --git a/dox/tests/test_runner.py b/dox/tests/test_runner.py
index aebec39..c227379 100644
--- a/dox/tests/test_runner.py
+++ b/dox/tests/test_runner.py
@@ -105,7 +105,7 @@ class TestRunner(base.TestCase):
         dr._run_shell_command = mock.MagicMock()
         dr._docker_cmd("version")
         dr._run_shell_command.assert_called_with(
-            ['docker', '-D', 'version']
+            ['docker', 'version']
         )
 
         dr = doxrunner.Runner(argparse.Namespace(user_map=None,