diff --git a/packages/docusaurus-plugin-content-blog/src/__tests__/authors.test.ts b/packages/docusaurus-plugin-content-blog/src/__tests__/authors.test.ts
index 29c59d82b765..052437c3dec6 100644
--- a/packages/docusaurus-plugin-content-blog/src/__tests__/authors.test.ts
+++ b/packages/docusaurus-plugin-content-blog/src/__tests__/authors.test.ts
@@ -113,6 +113,66 @@ describe('getBlogPostAuthors', () => {
         baseUrl: '/',
       }),
     ).toEqual([{key: 'slorber', name: 'Sébastien Lorber'}]);
+    expect(
+      getBlogPostAuthors({
+        frontMatter: {
+          authors: 'slorber',
+        },
+        authorsMap: {
+          slorber: {
+            name: 'Sébastien Lorber',
+            imageURL: 'https://github.com/slorber.png',
+          },
+        },
+        baseUrl: '/',
+      }),
+    ).toEqual([
+      {
+        key: 'slorber',
+        name: 'Sébastien Lorber',
+        imageURL: 'https://github.com/slorber.png',
+      },
+    ]);
+    expect(
+      getBlogPostAuthors({
+        frontMatter: {
+          authors: 'slorber',
+        },
+        authorsMap: {
+          slorber: {
+            name: 'Sébastien Lorber',
+            imageURL: '/img/slorber.png',
+          },
+        },
+        baseUrl: '/',
+      }),
+    ).toEqual([
+      {
+        key: 'slorber',
+        name: 'Sébastien Lorber',
+        imageURL: '/img/slorber.png',
+      },
+    ]);
+    expect(
+      getBlogPostAuthors({
+        frontMatter: {
+          authors: 'slorber',
+        },
+        authorsMap: {
+          slorber: {
+            name: 'Sébastien Lorber',
+            imageURL: '/img/slorber.png',
+          },
+        },
+        baseUrl: '/baseUrl',
+      }),
+    ).toEqual([
+      {
+        key: 'slorber',
+        name: 'Sébastien Lorber',
+        imageURL: '/baseUrl/img/slorber.png',
+      },
+    ]);
   });
 
   it('can read authors string[]', () => {
diff --git a/packages/docusaurus-plugin-content-blog/src/authors.ts b/packages/docusaurus-plugin-content-blog/src/authors.ts
index a46ecb8063e2..540341da7d73 100644
--- a/packages/docusaurus-plugin-content-blog/src/authors.ts
+++ b/packages/docusaurus-plugin-content-blog/src/authors.ts
@@ -74,16 +74,20 @@ type AuthorsParam = {
 
 // Legacy v1/early-v2 front matter fields
 // We may want to deprecate those in favor of using only frontMatter.authors
-function getFrontMatterAuthorLegacy(params: AuthorsParam): Author | undefined {
-  const name = params.frontMatter.author;
-  const title =
-    params.frontMatter.author_title ?? params.frontMatter.authorTitle;
-  const url = params.frontMatter.author_url ?? params.frontMatter.authorURL;
-  let imageURL =
-    params.frontMatter.author_image_url ?? params.frontMatter.authorImageURL;
-
-  if (params.baseUrl !== '/' && imageURL && !imageURL.startsWith('http')) {
-    imageURL = path.join(params.baseUrl, imageURL);
+function getFrontMatterAuthorLegacy({
+  baseUrl,
+  frontMatter,
+}: {
+  baseUrl: string;
+  frontMatter: BlogPostFrontMatter;
+}): Author | undefined {
+  const name = frontMatter.author;
+  const title = frontMatter.author_title ?? frontMatter.authorTitle;
+  const url = frontMatter.author_url ?? frontMatter.authorURL;
+  let imageURL = frontMatter.author_image_url ?? frontMatter.authorImageURL;
+
+  if (baseUrl !== '/' && imageURL && !imageURL.startsWith('http')) {
+    imageURL = path.join(baseUrl, imageURL);
   }
 
   if (name || title || url || imageURL) {