diff --git a/tests/test_module.py b/tests/test_module.py
index 9a5384d552..f27fa7b4ff 100644
--- a/tests/test_module.py
+++ b/tests/test_module.py
@@ -181,5 +181,24 @@ class ProjectTestCase(
                     {'project.work': map(int, works)}):
                 self.assertFalse(TimesheetLine.default_work())
 
+    @with_transaction()
+    def test_copy_work_with_children(self):
+        "Test copy work with children"
+        pool = Pool()
+        ProjectWork = pool.get('project.work')
+
+        company = create_company()
+        with set_company(company):
+            work, = ProjectWork.create([
+                    {'name': "Parent", 'children': [('create', [
+                        {'name': "Work 1", 'timesheet_available': True},
+                        {'name': "Work 2", 'timesheet_available': False},
+                        ])]}])
+            new_work, = ProjectWork.copy([work])
+
+            child1, child2 = new_work.children
+            self.assertTrue(child1.timesheet_available)
+            self.assertFalse(child2.timesheet_available)
+
 
 del ModuleTestCase
diff --git a/work.py b/work.py
index 081429b29e..9705a2488e 100644
--- a/work.py
+++ b/work.py
@@ -505,11 +505,20 @@ class Work(sequence_ordered(), tree(separator='\\'), ModelSQL, ModelView):
             default = {}
         else:
             default = default.copy()
-        default.setdefault('children', None)
         default.setdefault('progress', None)
         default.setdefault(
             'status', lambda data: WorkStatus.get_default_status(data['type']))
-        return super().copy(project_works, default=default)
+        new_works = super().copy(project_works, default=default)
+        to_save = []
+        for work, new_work in zip(project_works, new_works):
+            if work.timesheet_available:
+                new_work.timesheet_available = work.timesheet_available
+                new_work.timesheet_start_date = work.timesheet_start_date
+                new_work.timesheet_end_date = work.timesheet_end_date
+                to_save.append(new_work)
+        if to_save:
+            cls.save(to_save)
+        return new_works
 
     @classmethod
     def delete(cls, project_works):