diff --git a/src/markdown.ts b/src/markdown.ts
index 49b10f288..59dc5ee8d 100644
--- a/src/markdown.ts
+++ b/src/markdown.ts
@@ -422,7 +422,8 @@ function toParseCells(pieces: RenderPiece[]): CellPiece[] {
 }
 
 export async function parseMarkdown(source: string, root: string, sourcePath: string): Promise<ParseResult> {
-  const parts = matter(source);
+  const parts = matter(source, {});
+
   // TODO: We need to know what line in the source the markdown starts on and pass that
   // as startLine in the parse context below.
   const md = MarkdownIt({html: true});