diff --git a/packages/docusaurus-plugin-content-blog/src/__tests__/options.test.ts b/packages/docusaurus-plugin-content-blog/src/__tests__/options.test.ts
index 92eae01ae547..bb0f53c5f338 100644
--- a/packages/docusaurus-plugin-content-blog/src/__tests__/options.test.ts
+++ b/packages/docusaurus-plugin-content-blog/src/__tests__/options.test.ts
@@ -40,7 +40,7 @@ describe('validateOptions', () => {
       ...defaultOptions,
       feedOptions: {type: 'rss' as const, title: 'myTitle'},
       path: 'not_blog',
-      routeBasePath: 'myBlog',
+      routeBasePath: '/myBlog',
       postsPerPage: 5,
       include: ['api/*', 'docs/*'],
     };
@@ -53,7 +53,7 @@ describe('validateOptions', () => {
   it('accepts valid user options', () => {
     const userOptions: Options = {
       ...defaultOptions,
-      routeBasePath: 'myBlog',
+      routeBasePath: '/myBlog',
       beforeDefaultRemarkPlugins: [],
       beforeDefaultRehypePlugins: [markdownPluginsFunctionStub],
       remarkPlugins: [[markdownPluginsFunctionStub, {option1: '42'}]],
diff --git a/packages/docusaurus-plugin-content-docs/src/__tests__/options.test.ts b/packages/docusaurus-plugin-content-docs/src/__tests__/options.test.ts
index 47535f746ce0..260eaccb22d5 100644
--- a/packages/docusaurus-plugin-content-docs/src/__tests__/options.test.ts
+++ b/packages/docusaurus-plugin-content-docs/src/__tests__/options.test.ts
@@ -42,7 +42,7 @@ describe('normalizeDocsPluginOptions', () => {
   it('accepts correctly defined user options', () => {
     const userOptions: Options = {
       path: 'my-docs', // Path to data on filesystem, relative to site dir.
-      routeBasePath: 'my-docs', // URL Route.
+      routeBasePath: '/my-docs', // URL Route.
       tagsBasePath: 'tags', // URL Tags Route.
       include: ['**/*.{md,mdx}'], // Extensions to include.
       exclude: GlobExcludeDefault,
diff --git a/packages/docusaurus-plugin-content-pages/src/__tests__/options.test.ts b/packages/docusaurus-plugin-content-pages/src/__tests__/options.test.ts
index 29464c034b31..4112452f8288 100644
--- a/packages/docusaurus-plugin-content-pages/src/__tests__/options.test.ts
+++ b/packages/docusaurus-plugin-content-pages/src/__tests__/options.test.ts
@@ -33,7 +33,7 @@ describe('normalizePagesPluginOptions', () => {
   it('accepts correctly defined user options', () => {
     const userOptions = {
       path: 'src/my-pages',
-      routeBasePath: 'my-pages',
+      routeBasePath: '/my-pages',
       include: ['**/*.{js,jsx,ts,tsx}'],
       exclude: ['**/$*/'],
     };