diff --git a/app/config.py b/app/config.py
index 53eb1e8ac..1a462df1c 100644
--- a/app/config.py
+++ b/app/config.py
@@ -98,6 +98,7 @@ class Test(Development):
     WTF_CSRF_ENABLED = False
     CSV_UPLOAD_BUCKET_NAME = 'test-notifications-csv-upload'
     NOTIFY_ENVIRONMENT = 'test'
+    TEMPLATE_PREVIEW_API_HOST = 'http://localhost:9999'
 
 
 class Preview(Config):
diff --git a/tests/app/test_template_previews.py b/tests/app/test_template_previews.py
index 8c8200576..e1088bbdf 100644
--- a/tests/app/test_template_previews.py
+++ b/tests/app/test_template_previews.py
@@ -29,15 +29,15 @@ def test_from_utils_template_calls_through(
 @pytest.mark.parametrize('partial_call, expected_url', [
     (
         partial(TemplatePreview.from_database_object, filetype='bar'),
-        'http://localhost:6013/preview.bar',
+        'http://localhost:9999/preview.bar',
     ),
     (
         partial(TemplatePreview.from_database_object, filetype='baz'),
-        'http://localhost:6013/preview.baz',
+        'http://localhost:9999/preview.baz',
     ),
     (
         partial(TemplatePreview.from_database_object, filetype='bar', page=99),
-        'http://localhost:6013/preview.bar?page=99',
+        'http://localhost:9999/preview.bar?page=99',
     ),
 ])
 def test_from_database_object_makes_request(