diff --git a/octane/commands/install_node.py b/octane/commands/install_node.py
index 82561708..38d4101d 100644
--- a/octane/commands/install_node.py
+++ b/octane/commands/install_node.py
@@ -142,7 +142,7 @@ class InstallNodeCommand(cmd.Command):
             'node_ids', type=int, metavar='NODE_ID', nargs='+',
             help="IDs of nodes to be moved")
         parser.add_argument(
-            '--networks', type=str, nargs='+',
+            '--networks', type=str, nargs='+', default=[],
             help="Names of networks which IPs should be copied")
         return parser
 
diff --git a/octane/tests/test_install_node.py b/octane/tests/test_install_node.py
index 0664917f..f34c4389 100644
--- a/octane/tests/test_install_node.py
+++ b/octane/tests/test_install_node.py
@@ -26,6 +26,14 @@ def test_parser(mocker, octane_app):
                               networks=["public", "management"])
 
 
+def test_parser_no_networks(mocker, octane_app):
+    m = mocker.patch('octane.commands.install_node.install_node')
+    octane_app.run(["install-node", "--isolated", "1", "2", "3", "4"])
+    assert not octane_app.stdout.getvalue()
+    assert not octane_app.stderr.getvalue()
+    m.assert_called_once_with(1, 2, [3, 4], isolated=True, networks=[])
+
+
 @pytest.mark.parametrize("fail,side_effect", [
     (False, ([{'name': 'public'}, {'name': 'management'}],
              [{'name': 'public'}, {'name': 'management'}])),