diff --git a/.changeset/fresh-pillows-hear.md b/.changeset/fresh-pillows-hear.md
new file mode 100644
index 00000000..12bd0112
--- /dev/null
+++ b/.changeset/fresh-pillows-hear.md
@@ -0,0 +1,5 @@
+---
+'@hono/zod-openapi': patch
+---
+
+fix(zod-openapi): enable `basePath()`
diff --git a/packages/zod-openapi/src/index.ts b/packages/zod-openapi/src/index.ts
index 4c7f1a12..04362b44 100644
--- a/packages/zod-openapi/src/index.ts
+++ b/packages/zod-openapi/src/index.ts
@@ -347,6 +347,10 @@ export class OpenAPIHono<
     // eslint-disable-next-line @typescript-eslint/no-explicit-any
     return this as any
   }
+
+  basePath<SubPath extends string>(path: SubPath): OpenAPIHono<E, S, MergePath<BasePath, SubPath>> {
+    return new OpenAPIHono(super.basePath(path))
+  }
 }
 
 type RoutingPath<P extends string> = P extends `${infer Head}/{${infer Param}}${infer Tail}`
diff --git a/packages/zod-openapi/test/index.test.ts b/packages/zod-openapi/test/index.test.ts
index 65c0fa78..a0e20d1c 100644
--- a/packages/zod-openapi/test/index.test.ts
+++ b/packages/zod-openapi/test/index.test.ts
@@ -728,6 +728,39 @@ describe('Multi params', () => {
   })
 })
 
+describe('basePath()', () => {
+  const route = createRoute({
+    method: 'get',
+    path: '/message',
+    responses: {
+      200: {
+        description: 'Get message',
+      },
+    },
+  })
+
+  const app = new OpenAPIHono().basePath('/api')
+  app.openapi(route, (c) => c.jsonT({ message: 'Hello' }))
+  app.doc('/doc', {
+    openapi: '3.0.0',
+    info: {
+      version: '1.0.0',
+      title: 'My API',
+    },
+  })
+
+  it('Should return 200 response without type errors - /api/message', async () => {
+    const res = await app.request('/api/message')
+    expect(res.status).toBe(200)
+    expect(await res.json()).toEqual({ message: 'Hello' })
+  })
+
+  it('Should return 200 response - /api/doc', async () => {
+    const res = await app.request('/api/doc')
+    expect(res.status).toBe(200)
+  })
+})
+
 describe('With hc', () => {
   describe('Multiple routes', () => {
     const app = new OpenAPIHono()