diff --git a/erpnext/assets/doctype/asset_maintenance/asset_maintenance.py b/erpnext/assets/doctype/asset_maintenance/asset_maintenance.py
index d6adde6..1869a29 100644
--- a/erpnext/assets/doctype/asset_maintenance/asset_maintenance.py
+++ b/erpnext/assets/doctype/asset_maintenance/asset_maintenance.py
@@ -41,7 +41,7 @@
 	team_member = frappe.db.get_value('User', assign_to_member, "email")
 	args = {
 		'doctype' : 'Asset Maintenance',
-		'assign_to' : team_member,
+		'assign_to' : [team_member],
 		'name' : asset_maintenance_name,
 		'description' : maintenance_task,
 		'date' : next_due_date