diff --git a/app/templates/views/edit-broadcast-template.html b/app/templates/views/edit-broadcast-template.html
index 8c5d7cfe9..21b0374d3 100644
--- a/app/templates/views/edit-broadcast-template.html
+++ b/app/templates/views/edit-broadcast-template.html
@@ -24,7 +24,7 @@
         }) }}
       </div>
       <div class="govuk-grid-column-two-thirds">
-        {{ textbox(form.template_content, highlight_placeholders=False, width='1-1', rows=5) }}
+        {{ textbox(form.template_content, highlight_placeholders=False, autosize=True, width='1-1', rows=5) }}
         {{ sticky_page_footer('Save') }}
       </div>
     </div>
diff --git a/tests/app/main/views/test_templates.py b/tests/app/main/views/test_templates.py
index c7aac09a7..a45fcb06e 100644
--- a/tests/app/main/views/test_templates.py
+++ b/tests/app/main/views/test_templates.py
@@ -480,6 +480,7 @@ def test_broadcast_template_doesnt_highlight_placeholders(
         service_id=SERVICE_ONE_ID,
         template_id=fake_uuid,
     )
+    assert page.select_one('textarea')['data-module'] == 'enhanced-textbox'
     assert page.select_one('textarea')['data-highlight-placeholders'] == 'false'