diff --git a/watcher/decision_engine/strategy/strategies/host_maintenance.py b/watcher/decision_engine/strategy/strategies/host_maintenance.py
index f8b905b51..44d3228b6 100644
--- a/watcher/decision_engine/strategy/strategies/host_maintenance.py
+++ b/watcher/decision_engine/strategy/strategies/host_maintenance.py
@@ -89,14 +89,12 @@ class HostMaintenance(base.HostMaintenanceBaseStrategy):
                                    "will backup the maintenance node.",
                     "type": "string",
                 },
-                {
                 "disabled_reason": {
                         "description": "Describe reason for moving host"
                                        "into maintenance mode.",
                         "type": "string",
                         "default": False,
-                    }
-                }
+                },
                 "disable_live_migration": {
                     "description": "Disable live migration in maintenance. "
                                    "If True, active instances will be cold "