diff --git a/tests/test__main__/test_main_build_scenarios.py b/tests/test__main__/test_main_build_scenarios.py
index 5df3d8491..baae2d092 100644
--- a/tests/test__main__/test_main_build_scenarios.py
+++ b/tests/test__main__/test_main_build_scenarios.py
@@ -607,7 +607,8 @@ def test_banner_css_override(banner, local_docs, run):
     :param local_docs: conftest fixture.
     :param run: conftest fixture.
     """
-    local_docs.join('conf.py').write("html_context = {'css_files': ['_static/theme_overrides.css']}", mode='a')
+    local_docs.join('conf.py').write("html_context = {'css_files': ['_static/theme_overrides.css']}\n", mode='a')
+    local_docs.join('conf.py').write("html_static_path = ['_static']\n", mode='a')
     run(local_docs, ['git', 'commit', '-am', 'Setting override.'])
     run(local_docs, ['git', 'checkout', '-b', 'other', 'master'])
     run(local_docs, ['git', 'push', 'origin', 'master', 'other'])
@@ -627,6 +628,7 @@ def test_banner_css_override(banner, local_docs, run):
     # Check CSS.
     contents = destination.join('other', 'contents.html').read()
     assert 'rel="stylesheet" href="_static/banner.css"' in contents
+    assert destination.join('other', '_static', 'banner.css').check(file=True)
 
 
 def test_error_bad_path(tmpdir, run):