diff --git a/app/main/views/platform_admin.py b/app/main/views/platform_admin.py
index 5f051cf10..1259c7e5c 100644
--- a/app/main/views/platform_admin.py
+++ b/app/main/views/platform_admin.py
@@ -432,6 +432,9 @@ def clear_cache():
             'live-service-and-organisation-counts',
             'organisation-????????-????-????-????-????????????-name',
         ]),
+        ('broadcast', [
+            'service-????????-????-????-????-????????????-broadcast-message-????????-????-????-????-????????????',
+        ]),
     ])
 
     form = ClearCacheForm()
diff --git a/tests/app/main/views/test_platform_admin.py b/tests/app/main/views/test_platform_admin.py
index c75bab7e8..de704e0a2 100644
--- a/tests/app/main/views/test_platform_admin.py
+++ b/tests/app/main/views/test_platform_admin.py
@@ -692,7 +692,7 @@ def test_clear_cache_shows_form(client_request, platform_admin_user, mocker):
         call('service-????????-????-????-????-????????????-templates'),
         call('service-????????-????-????-????-????????????-template-????????-????-????-????-????????????-version-*'),
         call('service-????????-????-????-????-????????????-template-????????-????-????-????-????????????-versions'),
-    ], 'Removed 3 template objects from redis'),
+    ], 'Removed 103 template objects from redis'),
     ('service', [
         call('has_jobs-????????-????-????-????-????????????'),
         call('service-????????-????-????-????-????????????'),
@@ -701,13 +701,16 @@ def test_clear_cache_shows_form(client_request, platform_admin_user, mocker):
         call('service-????????-????-????-????-????????????-template-folders'),
         call('service-????????-????-????-????-????????????-returned-letters-statistics'),
         call('service-????????-????-????-????-????????????-returned-letters-summary'),
-    ], 'Removed 3 service objects from redis'),
+    ], 'Removed 107 service objects from redis'),
     ('organisation', [
         call('organisations'),
         call('domains'),
         call('live-service-and-organisation-counts'),
         call('organisation-????????-????-????-????-????????????-name'),
-    ], 'Removed 3 organisation objects from redis'),
+    ], 'Removed 104 organisation objects from redis'),
+    ('broadcast', [
+        call('service-????????-????-????-????-????????????-broadcast-message-????????-????-????-????-????????????'),
+    ], 'Removed 101 broadcast objects from redis'),
 ))
 def test_clear_cache_submits_and_tells_you_how_many_things_were_deleted(
     client_request,
@@ -718,7 +721,9 @@ def test_clear_cache_submits_and_tells_you_how_many_things_were_deleted(
     expected_confirmation,
 ):
     redis = mocker.patch('app.main.views.platform_admin.redis_client')
-    redis.delete_cache_keys_by_pattern.side_effect = [0, 3, 1, 0, 0, 0, 0, 0]
+    # The way this is set up means the first time `delete_cache_keys_by_pattern`
+    # is called it will return `101`, the second time it will return `102`, etc
+    redis.delete_cache_keys_by_pattern.side_effect = [101, 102, 103, 104, 105, 106, 107, 108, 109]
     client_request.login(platform_admin_user)
 
     page = client_request.post('main.clear_cache', _data={'model_type': model_type}, _expected_status=200)