diff --git a/addons/hr/models/hr_employee_base.py b/addons/hr/models/hr_employee_base.py
index b320881bd6b..9a21b15b8ac 100644
--- a/addons/hr/models/hr_employee_base.py
+++ b/addons/hr/models/hr_employee_base.py
@@ -92,7 +92,7 @@ class HrEmployeeBase(models.AbstractModel):
             raise UserError(_('Operation not supported'))
         # Double negation
         if not value:
-            operator = '=' if operator == '!=' else '='
+            operator = '!=' if operator == '=' else '='
         if not self.env.user.employee_id.department_id:
             return [('id', operator, self.env.user.employee_id.id)]
         return (['!'] if operator == '!=' else []) + [('department_id', 'child_of', self.env.user.employee_id.department_id.id)]
diff --git a/addons/hr/tests/test_hr_employee.py b/addons/hr/tests/test_hr_employee.py
index 087e3e407c6..ed9b813b99e 100644
--- a/addons/hr/tests/test_hr_employee.py
+++ b/addons/hr/tests/test_hr_employee.py
@@ -124,6 +124,19 @@ class TestHrEmployee(TestHrCommon):
         self.assertTrue(emp_sub_sub.member_of_department)
         self.assertFalse(emp_other.member_of_department)
         self.assertFalse(emp_parent.member_of_department)
+        employees = emp + emp_sub + emp_sub_sub + emp_other + emp_parent
+        self.assertEqual(
+            employees.filtered_domain(employees._search_part_of_department('=', True)),
+            emp + emp_sub + emp_sub_sub)
+        self.assertEqual(
+            employees.filtered_domain(employees._search_part_of_department('!=', False)),
+            emp + emp_sub + emp_sub_sub)
+        self.assertEqual(
+            employees.filtered_domain(employees._search_part_of_department('=', False)),
+            emp_other + emp_parent)
+        self.assertEqual(
+            employees.filtered_domain(employees._search_part_of_department('!=', True)),
+            emp_other + emp_parent)
 
     def test_employee_create_from_user(self):
         employee = self.env['hr.employee'].create({