diff --git a/zaqar/storage/mongodb/messages.py b/zaqar/storage/mongodb/messages.py
index ede09e839..39ed74654 100644
--- a/zaqar/storage/mongodb/messages.py
+++ b/zaqar/storage/mongodb/messages.py
@@ -645,7 +645,7 @@ class MessageController(storage.Message):
             for index, message in enumerate(messages)
         ]
 
-        ids = collection.insert(prepared_messages)
+        ids = collection.insert(prepared_messages, check_keys=False)
 
         return [str(id_) for id_ in ids]
 
@@ -838,7 +838,7 @@ class FIFOMessageController(MessageController):
         # before the operation is abandoned is 49.95 seconds.
         for attempt in self._retry_range:
             try:
-                ids = collection.insert(prepared_messages)
+                ids = collection.insert(prepared_messages, check_keys=False)
 
                 # Log a message if we retried, for debugging perf issues
                 if attempt != 0:
diff --git a/zaqar/tests/unit/storage/base.py b/zaqar/tests/unit/storage/base.py
index 6fa15ec64..adbe96761 100644
--- a/zaqar/tests/unit/storage/base.py
+++ b/zaqar/tests/unit/storage/base.py
@@ -740,6 +740,28 @@ class MessageControllerTest(ControllerBaseTest):
 
         self.assertEqual(1, len(popped_messages))
 
+    def test_message_period(self):
+        self.queue_controller.create(self.queue_name, project=self.project)
+        messages = [
+            {
+                'ttl': 60,
+                'body': {
+                    'event.data': 'BackupStarted',
+                    'backupId': 'c378813c-3f0b-11e2-ad92-7823d2b0f3ce',
+                },
+            },
+        ]
+
+        client_uuid = uuid.uuid1()
+        self.controller.post(self.queue_name, messages, client_uuid,
+                             project=self.project)
+
+        stored_messages = self.controller.list(self.queue_name,
+                                               project=self.project)
+
+        self.assertItemsEqual(['event.data', 'backupId'],
+                              list(next(stored_messages))[0]['body'].keys())
+
     def test_delete_message_from_nonexistent_queue(self):
         queue_name = 'fake_name'
         message_id = 'fake_id'