diff --git a/src/node/markdown/markdown.ts b/src/node/markdown/markdown.ts
index 1ed38025bc77..dbf24e2951e3 100644
--- a/src/node/markdown/markdown.ts
+++ b/src/node/markdown/markdown.ts
@@ -56,7 +56,7 @@ export type { Header }
 export const createMarkdownRenderer = async (
   srcDir: string,
   options: MarkdownOptions = {},
-  base: string
+  base = '/'
 ): Promise<MarkdownRenderer> => {
   const md = MarkdownIt({
     html: true,
diff --git a/src/node/markdownToVue.ts b/src/node/markdownToVue.ts
index 273d4dc134f4..8dca195e7e8d 100644
--- a/src/node/markdownToVue.ts
+++ b/src/node/markdownToVue.ts
@@ -27,7 +27,7 @@ export async function createMarkdownToVueRenderFn(
   pages: string[],
   userDefines: Record<string, any> | undefined,
   isBuild = false,
-  base: string,
+  base = '/',
   includeLastUpdatedData = false
 ) {
   const md = await createMarkdownRenderer(srcDir, options, base)