diff --git a/addons/mrp/models/mrp_workorder.py b/addons/mrp/models/mrp_workorder.py
index b6b27047a6e..6bf6319d8d4 100644
--- a/addons/mrp/models/mrp_workorder.py
+++ b/addons/mrp/models/mrp_workorder.py
@@ -767,7 +767,8 @@ class MrpWorkorder(models.Model):
                 AND wo2.state IN ('pending','ready')
                 AND wo1.id != wo2.id
                 AND wo1.workcenter_id = wo2.workcenter_id
-                AND (wo2.date_planned_start, wo2.date_planned_finished) OVERLAPS (wo1.date_planned_start, wo1.date_planned_finished)
+                AND (DATE_TRUNC('second', wo2.date_planned_start), DATE_TRUNC('second', wo2.date_planned_finished))
+                    OVERLAPS (DATE_TRUNC('second', wo1.date_planned_start), DATE_TRUNC('second', wo1.date_planned_finished))
         """
         self.env.cr.execute(sql, [tuple(self.ids)])
         res = defaultdict(list)
diff --git a/addons/mrp/tests/test_workorder_operation.py b/addons/mrp/tests/test_workorder_operation.py
index 1d0dd9ca0cf..3f4359e2f0b 100644
--- a/addons/mrp/tests/test_workorder_operation.py
+++ b/addons/mrp/tests/test_workorder_operation.py
@@ -1447,13 +1447,17 @@ class TestWorkOrderProcess(TestWorkOrderProcessCommon):
         self.assertEqual(wo2.state, 'pending')
         self.assertEqual(wo3.state, 'pending')
 
+        self.assertFalse(wo1.id in wo1._get_conflicted_workorder_ids(), "Shouldn't conflict")
+        self.assertFalse(wo2.id in wo2._get_conflicted_workorder_ids(), "Shouldn't conflict")
+        self.assertFalse(wo3.id in wo3._get_conflicted_workorder_ids(), "Shouldn't conflict")
+
         # Conflicted with wo1
         wo2.write({'date_planned_start': wo1.date_planned_start, 'date_planned_finished': wo1.date_planned_finished})
         # Bad order of workorders (wo3-wo1-wo2) + Late
         wo3.write({'date_planned_start': wo1.date_planned_start - timedelta(weeks=1), 'date_planned_finished': wo1.date_planned_finished - timedelta(weeks=1)})
 
-        self.assertEqual(wo2.id in wo2._get_conflicted_workorder_ids(), True, "Should conflict with wo1")
-        self.assertEqual(wo1.id in wo1._get_conflicted_workorder_ids(), True, "Should conflict with wo2")
+        self.assertTrue(wo2.id in wo2._get_conflicted_workorder_ids(), "Should conflict with wo1")
+        self.assertTrue(wo1.id in wo1._get_conflicted_workorder_ids(), "Should conflict with wo2")
 
         self.assertTrue('text-danger' in wo2.json_popover, "Popover should in be in red (due to conflict)")
         self.assertTrue('text-danger' in wo3.json_popover, "Popover should in be in red (due to bad order of wo)")