diff --git a/src/render.ts b/src/render.ts
index 183c7c5..5cb6bc2 100644
--- a/src/render.ts
+++ b/src/render.ts
@@ -27,6 +27,7 @@ export interface MarkdownExtension {
 
 export async function render_markdown_to_html(markdown: string, options: MarkdownOptions = { }) {
 	const marked_options = marked_opts(options);
+	setup_marked(options, marked_options);
 	const unsafe_html = options.inline
 		? marked.parseInline(markdown, marked_options)
 		: marked.parse(markdown, marked_options);