diff --git a/nova/api/openstack/compute/deferred_delete.py b/nova/api/openstack/compute/deferred_delete.py
index e8743fc625..c47838b030 100644
--- a/nova/api/openstack/compute/deferred_delete.py
+++ b/nova/api/openstack/compute/deferred_delete.py
@@ -62,9 +62,8 @@ class DeferredDeleteController(wsgi.Controller):
                             'project_id': instance.project_id})
         try:
             self.compute_api.force_delete(context, instance)
-        except exception.InstanceNotFound as e:
-            raise webob.exc.HTTPNotFound(explanation=e.format_message())
-        except exception.InstanceUnknownCell as e:
+        except (exception.InstanceNotFound,
+                exception.InstanceUnknownCell) as e:
             raise webob.exc.HTTPNotFound(explanation=e.format_message())
         except exception.InstanceIsLocked as e:
             raise webob.exc.HTTPConflict(explanation=e.format_message())
diff --git a/nova/api/openstack/compute/server_tags.py b/nova/api/openstack/compute/server_tags.py
index f2572ac02a..3eb0b401e1 100644
--- a/nova/api/openstack/compute/server_tags.py
+++ b/nova/api/openstack/compute/server_tags.py
@@ -183,9 +183,8 @@ class ServerTagsController(wsgi.Controller):
         try:
             with nova_context.target_cell(context, im.cell_mapping):
                 objects.Tag.destroy(context, server_id, id)
-        except exception.InstanceTagNotFound as e:
-            raise webob.exc.HTTPNotFound(explanation=e.format_message())
-        except exception.InstanceNotFound as e:
+        except (exception.InstanceTagNotFound,
+                exception.InstanceNotFound) as e:
             raise webob.exc.HTTPNotFound(explanation=e.format_message())
 
     @wsgi.Controller.api_version("2.26")
diff --git a/nova/api/openstack/compute/volumes.py b/nova/api/openstack/compute/volumes.py
index e5ea504220..ca16b3750f 100644
--- a/nova/api/openstack/compute/volumes.py
+++ b/nova/api/openstack/compute/volumes.py
@@ -336,13 +336,11 @@ class VolumeAttachmentController(wsgi.Controller):
         try:
             device = self.compute_api.attach_volume(context, instance,
                                                     volume_id, device)
-        except exception.InstanceUnknownCell as e:
+        except (exception.InstanceUnknownCell,
+                exception.VolumeNotFound) as e:
             raise exc.HTTPNotFound(explanation=e.format_message())
-        except exception.VolumeNotFound as e:
-            raise exc.HTTPNotFound(explanation=e.format_message())
-        except exception.InstanceIsLocked as e:
-            raise exc.HTTPConflict(explanation=e.format_message())
-        except exception.DevicePathInUse as e:
+        except (exception.InstanceIsLocked,
+                exception.DevicePathInUse) as e:
             raise exc.HTTPConflict(explanation=e.format_message())
         except exception.InstanceInvalidState as state_error:
             common.raise_http_conflict_for_instance_invalid_state(state_error,