diff --git a/extensions/markdown-language-features/src/markdownEngine.ts b/extensions/markdown-language-features/src/markdownEngine.ts
index 83d7e82da95..c9f162ad294 100644
--- a/extensions/markdown-language-features/src/markdownEngine.ts
+++ b/extensions/markdown-language-features/src/markdownEngine.ts
@@ -191,7 +191,7 @@ export class MarkdownEngine {
 	}
 
 	private getConfig(resource?: vscode.Uri): MarkdownItConfig {
-		const config = vscode.workspace.getConfiguration('markdown', resource);
+		const config = vscode.workspace.getConfiguration('markdown', resource ?? null);
 		return {
 			breaks: config.get<boolean>('preview.breaks', false),
 			linkify: config.get<boolean>('preview.linkify', true),