diff --git a/airflow/models/taskinstance.py b/airflow/models/taskinstance.py
index 0f5d49b819762..7913cff7ff7c5 100644
--- a/airflow/models/taskinstance.py
+++ b/airflow/models/taskinstance.py
@@ -771,7 +771,13 @@ def log_url(self):
         """Log URL for TaskInstance"""
         iso = quote(self.execution_date.isoformat())
         base_url = conf.get('webserver', 'BASE_URL')
-        return base_url + f"/log?execution_date={iso}&task_id={self.task_id}&dag_id={self.dag_id}"
+        return (
+            f"{base_url}/log"
+            f"?execution_date={iso}"
+            f"&task_id={self.task_id}"
+            f"&dag_id={self.dag_id}"
+            f"&map_index={self.map_index}"
+        )
 
     @property
     def mark_success_url(self):
diff --git a/tests/models/test_taskinstance.py b/tests/models/test_taskinstance.py
index a1d180fa1ee56..da3d138306235 100644
--- a/tests/models/test_taskinstance.py
+++ b/tests/models/test_taskinstance.py
@@ -1307,18 +1307,6 @@ def test_get_num_running_task_instances(self, create_task_instance):
         assert 1 == ti2.get_num_running_task_instances(session=session)
         assert 1 == ti3.get_num_running_task_instances(session=session)
 
-    # def test_log_url(self):
-    #     now = pendulum.now('Europe/Brussels')
-    #     dag = DAG('dag', start_date=DEFAULT_DATE)
-    #     task = EmptyOperator(task_id='op', dag=dag)
-    #     ti = TI(task=task, execution_date=now)
-    #     d = urllib.parse.parse_qs(
-    #         urllib.parse.urlparse(ti.log_url).query,
-    #         keep_blank_values=True, strict_parsing=True)
-    #     self.assertEqual(d['dag_id'][0], 'dag')
-    #     self.assertEqual(d['task_id'][0], 'op')
-    #     self.assertEqual(pendulum.parse(d['execution_date'][0]), now)
-
     def test_log_url(self, create_task_instance):
         ti = create_task_instance(dag_id='dag', task_id='op', execution_date=timezone.datetime(2018, 1, 1))
 
@@ -1327,6 +1315,7 @@ def test_log_url(self, create_task_instance):
             'execution_date=2018-01-01T00%3A00%3A00%2B00%3A00'
             '&task_id=op'
             '&dag_id=dag'
+            '&map_index=-1'
         )
         assert ti.log_url == expected_url