diff --git a/sushy/connector.py b/sushy/connector.py
index 003f4b91..f8a9f82f 100644
--- a/sushy/connector.py
+++ b/sushy/connector.py
@@ -93,7 +93,10 @@ class Connector(object):
         url = path if urlparse.urlparse(path).netloc else urlparse.urljoin(
             self._url, path)
         headers = headers or {}
-        if not any(k.lower() == 'odata-version' for k in headers):
+        lc_headers = [k.lower() for k in headers]
+        if data is not None and 'content-type' not in lc_headers:
+            headers['Content-Type'] = 'application/json'
+        if 'odata-version' not in lc_headers:
             headers['OData-Version'] = '4.0'
         # TODO(lucasagomes): We should mask the data to remove sensitive
         # information
diff --git a/sushy/tests/unit/test_connector.py b/sushy/tests/unit/test_connector.py
index 0e131ab8..729a6779 100644
--- a/sushy/tests/unit/test_connector.py
+++ b/sushy/tests/unit/test_connector.py
@@ -220,6 +220,7 @@ class ConnectorOpTestCase(base.TestCase):
         self.conn._session.headers['X-Auth-Token'] = 'asdf1234'
         expected_headers = self.headers.copy()
         expected_headers['OData-Version'] = '4.0'
+        expected_headers['Content-Type'] = 'application/json'
         self.conn._op('POST', path='fake/path', headers=self.headers,
                       data=self.data)
         self.request.assert_called_once_with(