diff --git a/openstackclient/tests/volume/v1/test_volume.py b/openstackclient/tests/volume/v1/test_volume.py
index e4f51bb535..380bc632d6 100644
--- a/openstackclient/tests/volume/v1/test_volume.py
+++ b/openstackclient/tests/volume/v1/test_volume.py
@@ -14,6 +14,7 @@
 #
 
 import copy
+import mock
 
 from openstackclient.tests import fakes
 from openstackclient.tests.identity.v2_0 import fakes as identity_fakes
@@ -656,7 +657,8 @@ class TestVolumeSet(TestVolume):
         )
         self.assertIsNone(result)
 
-    def test_volume_set_size_smaller(self):
+    @mock.patch.object(volume.LOG, 'error')
+    def test_volume_set_size_smaller(self, mock_log_error):
         arglist = [
             '--size', '100',
             volume_fakes.volume_name,
@@ -672,12 +674,13 @@ class TestVolumeSet(TestVolume):
 
         result = self.cmd.take_action(parsed_args)
 
-        self.assertEqual("New size must be greater than %s GB" %
-                         volume_fakes.volume_size,
-                         self.app.log.messages.get('error'))
+        mock_log_error.assert_called_with("New size must be greater "
+                                          "than %s GB",
+                                          volume_fakes.volume_size)
         self.assertIsNone(result)
 
-    def test_volume_set_size_not_available(self):
+    @mock.patch.object(volume.LOG, 'error')
+    def test_volume_set_size_not_available(self, mock_log_error):
         self.volumes_mock.get.return_value.status = 'error'
         arglist = [
             '--size', '130',
@@ -694,9 +697,9 @@ class TestVolumeSet(TestVolume):
 
         result = self.cmd.take_action(parsed_args)
 
-        self.assertEqual("Volume is in %s state, it must be available before "
-                         "size can be extended" % 'error',
-                         self.app.log.messages.get('error'))
+        mock_log_error.assert_called_with("Volume is in %s state, it must be "
+                                          "available before size can be "
+                                          "extended", 'error')
         self.assertIsNone(result)
 
     def test_volume_set_property(self):
diff --git a/openstackclient/volume/v1/volume.py b/openstackclient/volume/v1/volume.py
index 7a3bfb971b..e11aa1a71c 100644
--- a/openstackclient/volume/v1/volume.py
+++ b/openstackclient/volume/v1/volume.py
@@ -16,6 +16,7 @@
 """Volume v1 Volume action implementations"""
 
 import argparse
+import logging
 
 from osc_lib.cli import parseractions
 from osc_lib.command import command
@@ -25,6 +26,9 @@ import six
 from openstackclient.i18n import _
 
 
+LOG = logging.getLogger(__name__)
+
+
 class CreateVolume(command.ShowOne):
     """Create new volume"""
 
@@ -343,13 +347,12 @@ class SetVolume(command.Command):
 
         if parsed_args.size:
             if volume.status != 'available':
-                self.app.log.error(_("Volume is in %s state, it must be "
-                                   "available before size can be extended") %
-                                   volume.status)
+                LOG.error(_("Volume is in %s state, it must be available "
+                            "before size can be extended"), volume.status)
                 return
             if parsed_args.size <= volume.size:
-                self.app.log.error(_("New size must be greater than %s GB") %
-                                   volume.size)
+                LOG.error(_("New size must be greater than %s GB"),
+                          volume.size)
                 return
             volume_client.volumes.extend(volume.id, parsed_args.size)
 
diff --git a/openstackclient/volume/v2/volume.py b/openstackclient/volume/v2/volume.py
index b1a3af2efc..e54395fa01 100644
--- a/openstackclient/volume/v2/volume.py
+++ b/openstackclient/volume/v2/volume.py
@@ -15,6 +15,7 @@
 """Volume V2 Volume action implementations"""
 
 import copy
+import logging
 
 from osc_lib.cli import parseractions
 from osc_lib.command import command
@@ -25,6 +26,9 @@ from openstackclient.i18n import _
 from openstackclient.identity import common as identity_common
 
 
+LOG = logging.getLogger(__name__)
+
+
 class CreateVolume(command.ShowOne):
     """Create new volume"""
 
@@ -361,13 +365,12 @@ class SetVolume(command.Command):
 
         if parsed_args.size:
             if volume.status != 'available':
-                self.app.log.error(_("Volume is in %s state, it must be "
-                                   "available before size can be extended") %
-                                   volume.status)
+                LOG.error(_("Volume is in %s state, it must be available "
+                            "before size can be extended"), volume.status)
                 return
             if parsed_args.size <= volume.size:
-                self.app.log.error(_("New size must be greater than %s GB") %
-                                   volume.size)
+                LOG.error(_("New size must be greater than %s GB"),
+                          volume.size)
                 return
             volume_client.volumes.extend(volume.id, parsed_args.size)
 
@@ -456,4 +459,4 @@ class UnsetVolume(command.Command):
                 volume.id, parsed_args.image_property)
 
         if (not parsed_args.image_property and not parsed_args.property):
-            self.app.log.error(_("No changes requested\n"))
+            LOG.error(_("No changes requested"))
diff --git a/openstackclient/volume/v2/volume_type.py b/openstackclient/volume/v2/volume_type.py
index dc6b4f9b27..5e9faa1ded 100644
--- a/openstackclient/volume/v2/volume_type.py
+++ b/openstackclient/volume/v2/volume_type.py
@@ -14,6 +14,8 @@
 
 """Volume v2 Type action implementations"""
 
+import logging
+
 from osc_lib.cli import parseractions
 from osc_lib.command import command
 from osc_lib import exceptions
@@ -24,6 +26,9 @@ from openstackclient.i18n import _
 from openstackclient.identity import common as identity_common
 
 
+LOG = logging.getLogger(__name__)
+
+
 class CreateVolumeType(command.ShowOne):
     """Create new volume type"""
 
@@ -190,16 +195,15 @@ class SetVolumeType(command.Command):
                     **kwargs
                 )
             except Exception as e:
-                self.app.log.error(_("Failed to update volume type name or"
-                                     " description: %s") % str(e))
+                LOG.error(_("Failed to update volume type name or"
+                            " description: %s"), e)
                 result += 1
 
         if parsed_args.property:
             try:
                 volume_type.set_keys(parsed_args.property)
             except Exception as e:
-                self.app.log.error(_("Failed to set volume type"
-                                     " property: %s") % str(e))
+                LOG.error(_("Failed to set volume type property: %s"), e)
                 result += 1
 
         if parsed_args.project:
@@ -213,13 +217,13 @@ class SetVolumeType(command.Command):
                 volume_client.volume_type_access.add_project_access(
                     volume_type.id, project_info.id)
             except Exception as e:
-                self.app.log.error(_("Failed to set volume type access to"
-                                     " project: %s") % str(e))
+                LOG.error(_("Failed to set volume type access to "
+                            "project: %s"), e)
                 result += 1
 
         if result > 0:
             raise exceptions.CommandError(_("Command Failed: One or more of"
-                                          " the operations failed"))
+                                            " the operations failed"))
 
 
 class ShowVolumeType(command.ShowOne):
@@ -284,8 +288,7 @@ class UnsetVolumeType(command.Command):
             try:
                 volume_type.unset_keys(parsed_args.property)
             except Exception as e:
-                self.app.log.error(_("Failed to unset volume type property: %s"
-                                     ) % str(e))
+                LOG.error(_("Failed to unset volume type property: %s"), e)
                 result += 1
 
         if parsed_args.project:
@@ -299,8 +302,8 @@ class UnsetVolumeType(command.Command):
                 volume_client.volume_type_access.remove_project_access(
                     volume_type.id, project_info.id)
             except Exception as e:
-                self.app.log.error(_("Failed to remove volume type access from"
-                                   " project: %s") % str(e))
+                LOG.error(_("Failed to remove volume type access from "
+                            "project: %s"), e)
                 result += 1
 
         if result > 0: