diff --git a/cinder/brick/local_dev/lvm.py b/cinder/brick/local_dev/lvm.py
index ea75b8fecd9..61a3c23faf0 100644
--- a/cinder/brick/local_dev/lvm.py
+++ b/cinder/brick/local_dev/lvm.py
@@ -832,8 +832,7 @@ class LVM(executor.Executor):
         try:
             cmd = LVM.LVM_CMD_PREFIX + ['lvextend', '-L', new_size,
                                         '%s/%s' % (self.vg_name, lv_name)]
-            self._execute(*cmd, root_helper=self._root_helper,
-                          run_as_root=True)
+            self._run_lvm_command(cmd)
         except putils.ProcessExecutionError as err:
             LOG.exception('Error extending Volume')
             LOG.error('Cmd     :%s', err.cmd)
diff --git a/cinder/tests/unit/brick/test_brick_lvm.py b/cinder/tests/unit/brick/test_brick_lvm.py
index df092b3ad71..b4605446b58 100644
--- a/cinder/tests/unit/brick/test_brick_lvm.py
+++ b/cinder/tests/unit/brick/test_brick_lvm.py
@@ -456,7 +456,7 @@ class BrickLvmTestCase(test.TestCase):
 
     @ddt.data(True, False)
     def test_lv_extend(self, has_snapshot):
-        with mock.patch.object(self.vg, '_execute'):
+        with mock.patch.object(self.vg, '_execute', return_value=('', '')):
             with mock.patch.object(self.vg, 'lv_has_snapshot'):
                 self.vg.deactivate_lv = mock.MagicMock()
                 self.vg.activate_lv = mock.MagicMock()