diff --git a/app/broadcast_message/rest.py b/app/broadcast_message/rest.py
index 02b734ec2..df814de9a 100644
--- a/app/broadcast_message/rest.py
+++ b/app/broadcast_message/rest.py
@@ -212,7 +212,7 @@ def update_broadcast_message(service_id, broadcast_message_id):
         broadcast_message.starts_at = _parse_nullable_datetime(data['starts_at'])
     if 'finishes_at' in data:
         broadcast_message.finishes_at = _parse_nullable_datetime(data['finishes_at'])
-    if 'areas' in areas and 'simple_polygons' in areas:
+    if 'ids' in areas and 'simple_polygons' in areas:
         broadcast_message.areas = areas
 
     dao_save_object(broadcast_message)
diff --git a/tests/app/broadcast_message/test_rest.py b/tests/app/broadcast_message/test_rest.py
index cfe6bc3ff..ff08e121d 100644
--- a/tests/app/broadcast_message/test_rest.py
+++ b/tests/app/broadcast_message/test_rest.py
@@ -449,7 +449,7 @@ def test_update_broadcast_message_doesnt_allow_edits_after_broadcast_goes_live(
     status
 ):
     t = create_template(sample_broadcast_service, BROADCAST_TYPE)
-    bm = create_broadcast_message(t, areas=['manchester'], status=status)
+    bm = create_broadcast_message(t, status=status)
 
     response = admin_request.post(
         'broadcast_message.update_broadcast_message',
@@ -658,7 +658,6 @@ def test_update_broadcast_message_status_stores_approved_by_and_approved_at_and_
         t,
         status=BroadcastStatusType.PENDING_APPROVAL,
         areas={
-            "areas": ["london"],
             "ids": ["london"],
             "simple_polygons": [[[51.30, 0.7], [51.28, 0.8], [51.25, -0.7]]]
         }
@@ -708,7 +707,7 @@ def test_update_broadcast_message_status_updates_details_but_does_not_queue_task
     bm = create_broadcast_message(
         t,
         status=BroadcastStatusType.PENDING_APPROVAL,
-        areas={"areas": ["london"], "simple_polygons": [[[51.30, 0.7], [51.28, 0.8], [51.25, -0.7]]]},
+        areas={"ids": ["london"], "simple_polygons": [[[51.30, 0.7], [51.28, 0.8], [51.25, -0.7]]]},
         stubbed=broadcast_message_stubbed
     )
     approver = create_user(email='approver@gov.uk')
@@ -761,7 +760,6 @@ def test_update_broadcast_message_status_creates_event_with_correct_content_if_b
         content='tailor made emergency broadcast content',
         status=BroadcastStatusType.PENDING_APPROVAL,
         areas={
-            "areas": ["london"],
             "ids": ["london"],
             "simple_polygons": [[[51.30, 0.7], [51.28, 0.8], [51.25, -0.7]]]
         }
@@ -849,7 +847,7 @@ def test_update_broadcast_message_status_allows_trial_mode_services_to_approve_o
     bm = create_broadcast_message(
         t,
         status=BroadcastStatusType.PENDING_APPROVAL,
-        areas={"areas": ["london"], "simple_polygons": [[[51.30, 0.7], [51.28, 0.8], [51.25, -0.7]]]}
+        areas={"ids": ["london"], "simple_polygons": [[[51.30, 0.7], [51.28, 0.8], [51.25, -0.7]]]}
     )
     mock_task = mocker.patch('app.celery.broadcast_message_tasks.send_broadcast_event.apply_async')
 
diff --git a/tests/app/celery/test_broadcast_message_tasks.py b/tests/app/celery/test_broadcast_message_tasks.py
index fce2d2e91..e10f6cbf8 100644
--- a/tests/app/celery/test_broadcast_message_tasks.py
+++ b/tests/app/celery/test_broadcast_message_tasks.py
@@ -100,7 +100,7 @@ def test_send_broadcast_event_creates_zendesk_p1(mocker, notify_api, sample_broa
     broadcast_message = create_broadcast_message(
         template,
         status=BroadcastStatusType.BROADCASTING,
-        areas={'areas': ['wd20-S13002775', 'wd20-S13002773'], 'simple_polygons': []},
+        areas={'ids': ['wd20-S13002775', 'wd20-S13002773'], 'simple_polygons': []},
     )
     event = create_broadcast_event(broadcast_message)
     mock_create_ticket = mocker.patch("app.celery.broadcast_message_tasks.zendesk_client.create_ticket")