diff --git a/packages/plugin-auto-frontmatter/src/node/plugin.ts b/packages/plugin-auto-frontmatter/src/node/plugin.ts
index 3857b6b8..193a36ce 100644
--- a/packages/plugin-auto-frontmatter/src/node/plugin.ts
+++ b/packages/plugin-auto-frontmatter/src/node/plugin.ts
@@ -35,7 +35,7 @@ export const autoFrontmatterPlugin = ({
     .map(({ include, formatter }) => {
       return {
         include,
-        filter: createFilter(include),
+        filter: createFilter(ensureArray(include)),
         formatter,
       }
     })