diff --git a/erpnext/hr/utils.py b/erpnext/hr/utils.py
index cd12510..8d95924 100644
--- a/erpnext/hr/utils.py
+++ b/erpnext/hr/utils.py
@@ -73,11 +73,11 @@
 	def assign_task_to_users(self, task, users):
 		for user in users:
 			args = {
-				'assign_to' 	:	user,
-				'doctype'		:	task.doctype,
-				'name'			:	task.name,
-				'description'	:	task.description or task.subject,
-				'notify':	self.notify_users_by_email
+				'assign_to': [user],
+				'doctype': task.doctype,
+				'name': task.name,
+				'description': task.description or task.subject,
+				'notify': self.notify_users_by_email
 			}
 			assign_to.add(args)