diff --git a/cinder/tests/unit/volume/drivers/test_rbd.py b/cinder/tests/unit/volume/drivers/test_rbd.py
index 7857c9451bf..2ff9d8d813a 100644
--- a/cinder/tests/unit/volume/drivers/test_rbd.py
+++ b/cinder/tests/unit/volume/drivers/test_rbd.py
@@ -879,7 +879,8 @@ class RBDTestCase(test.TestCase):
                     'auth_username': None,
                     'secret_type': 'ceph',
                     'secret_uuid': None,
-                    'volume_id': self.volume_a.id
+                    'volume_id': self.volume_a.id,
+                    'discard': True,
                 }
             }
             actual = self.driver.initialize_connection(self.volume_a, None)
diff --git a/cinder/volume/drivers/rbd.py b/cinder/volume/drivers/rbd.py
index 356e2fed115..d50c6de2461 100644
--- a/cinder/volume/drivers/rbd.py
+++ b/cinder/volume/drivers/rbd.py
@@ -831,6 +831,7 @@ class RBDDriver(driver.TransferVD, driver.ExtendVD,
                 'secret_type': 'ceph',
                 'secret_uuid': self.configuration.rbd_secret_uuid,
                 'volume_id': volume.id,
+                "discard": True,
             }
         }
         LOG.debug('connection data: %s', data)