diff --git a/freqtrade/persistence/trade_model.py b/freqtrade/persistence/trade_model.py
index 57aeda76c..d2abb48d6 100644
--- a/freqtrade/persistence/trade_model.py
+++ b/freqtrade/persistence/trade_model.py
@@ -130,7 +130,7 @@ class Order(_DECL_BASE):
             'side': self.ft_order_side,
             'filled': self.filled,
             'remaining': self.remaining,
-            'datetime': self.order_date_utc.strftime('%Y-%m-%dT%H:%M:%S.%3f'),
+            'datetime': self.order_date_utc.strftime('%Y-%m-%dT%H:%M:%S.%f'),
             'timestamp': int(self.order_date_utc.timestamp() * 1000),
             'status': self.status,
             'fee': None,
diff --git a/tests/conftest.py b/tests/conftest.py
index 8719c70f4..02738b0e9 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1616,6 +1616,7 @@ def limit_buy_order_open():
         'datetime': arrow.utcnow().isoformat(),
         'price': 0.00001099,
         'amount': 90.99181073,
+        'average': None,
         'filled': 0.0,
         'cost': 0.0009999,
         'remaining': 90.99181073,
diff --git a/tests/test_persistence.py b/tests/test_persistence.py
index ef17c4d1c..be19a3f5f 100644
--- a/tests/test_persistence.py
+++ b/tests/test_persistence.py
@@ -2671,3 +2671,21 @@ def test_select_filled_orders(fee):
     orders = trades[4].select_filled_orders('sell')
     assert orders is not None
     assert len(orders) == 0
+
+
+@pytest.mark.usefixtures("init_persistence")
+def test_order_to_ccxt(limit_buy_order_open):
+
+    order = Order.parse_from_ccxt_object(limit_buy_order_open, 'mocked', 'buy')
+    order.query.session.add(order)
+    Order.query.session.commit()
+
+    order_resp = Order.order_by_id(limit_buy_order_open['id'])
+    assert order_resp
+
+    raw_order = order_resp.to_ccxt_object()
+    del raw_order['fee']
+    del raw_order['datetime']
+    del raw_order['info']
+    del limit_buy_order_open['datetime']
+    assert raw_order == limit_buy_order_open