diff --git a/tackerclient/tacker/v1_0/__init__.py b/tackerclient/tacker/v1_0/__init__.py
index a5211e86..edfab994 100644
--- a/tackerclient/tacker/v1_0/__init__.py
+++ b/tackerclient/tacker/v1_0/__init__.py
@@ -649,6 +649,10 @@ class ShowCommand(TackerCommand, show.ShowOne):
     log = None
     allow_names = True
 
+    def get_id(self):
+        if self.resource:
+            return self.resource.upper()
+
     def get_parser(self, prog_name):
         parser = super(ShowCommand, self).get_parser(prog_name)
         add_show_list_common_argument(parser)
@@ -657,7 +661,7 @@ class ShowCommand(TackerCommand, show.ShowOne):
         else:
             help_str = _('ID of %s to look up')
         parser.add_argument(
-            'id', metavar=self.resource.upper(),
+            'id', metavar=self.get_id(),
             help=help_str % self.resource)
         return parser
 
diff --git a/tackerclient/tacker/v1_0/extension.py b/tackerclient/tacker/v1_0/extension.py
index 67ba64da..29612c2d 100644
--- a/tackerclient/tacker/v1_0/extension.py
+++ b/tackerclient/tacker/v1_0/extension.py
@@ -14,7 +14,6 @@
 #    under the License.
 #
 
-from tackerclient.common._i18n import _
 from tackerclient.tacker import v1_0 as cmd_base
 
 
@@ -31,10 +30,5 @@ class ShowExt(cmd_base.ShowCommand):
     resource = "extension"
     allow_names = False
 
-    def get_parser(self, prog_name):
-        parser = super(ShowExt, self).get_parser(prog_name)
-        cmd_base.add_show_list_common_argument(parser)
-        parser.add_argument(
-            'id', metavar='EXT-ALIAS',
-            help=_('The extension alias'))
-        return parser
+    def get_id(self):
+        return 'EXT-ALIAS'