diff --git a/python_docs_theme/__init__.py b/python_docs_theme/__init__.py
index 62b16f0..bbe1352 100644
--- a/python_docs_theme/__init__.py
+++ b/python_docs_theme/__init__.py
@@ -37,7 +37,7 @@ def _html_page_context(
assert isinstance(app.builder, StandaloneHTMLBuilder)
- if "css_files" in context:
+ if sphinx.version_info >= (4,) and "css_files" in context:
if "_static/pydoctheme.css" not in context["css_files"]:
raise ValueError(
"This documentation is not using `pydoctheme.css` as the stylesheet. "
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