diff --git a/senlinclient/tests/unit/v1/test_shell.py b/senlinclient/tests/unit/v1/test_shell.py
index e2d1ef2..98e84cc 100644
--- a/senlinclient/tests/unit/v1/test_shell.py
+++ b/senlinclient/tests/unit/v1/test_shell.py
@@ -819,7 +819,7 @@ class ShellTest(testtools.TestCase):
                                sh.do_cluster_resize,
                                service, args)
         msg = _('Cluster capacity must be larger than '
-                ' or equal to zero.')
+                'or equal to zero.')
         self.assertEqual(msg, six.text_type(ex))
 
         # adjustment
diff --git a/senlinclient/v1/shell.py b/senlinclient/v1/shell.py
index 6ef78e3..24853f1 100644
--- a/senlinclient/v1/shell.py
+++ b/senlinclient/v1/shell.py
@@ -659,7 +659,7 @@ def do_cluster_resize(service, args):
     if capacity is not None:
         if capacity < 0:
             raise exc.CommandError(_('Cluster capacity must be larger than '
-                                     ' or equal to zero.'))
+                                     'or equal to zero.'))
         action_args['adjustment_type'] = 'EXACT_CAPACITY'
         action_args['number'] = capacity