diff --git a/ironic_tempest_plugin/config.py b/ironic_tempest_plugin/config.py
index 36d59df..e39f8f8 100644
--- a/ironic_tempest_plugin/config.py
+++ b/ironic_tempest_plugin/config.py
@@ -67,7 +67,6 @@
     #                 "Takes longer since Kilo as Ironic performs an extra "
     #                 "step in Node cleaning.")
     cfg.StrOpt('min_microversion',
-               default=None,
                help="Lower version of the test target microversion range. "
                     "The format is 'X.Y', where 'X' and 'Y' are int values. "
                     "Tempest selects tests based on the range between "