diff --git a/frontend/src/App.tsx b/frontend/src/App.tsx
index 5d2e8a6..d844463 100644
--- a/frontend/src/App.tsx
+++ b/frontend/src/App.tsx
@@ -1,11 +1,10 @@
-import axios from 'axios'
 import { useEffect, useState } from 'react'
 import { BrowserRouter, Navigate, Route, Routes, useLocation } from 'react-router-dom'
 
 import RouteBlockerOverlay from '@/components/RouteBlockerOverlay'
 import TopNav from '@/components/TopNav'
 import { Toaster } from '@/components/ui/toaster'
-import { apiPost } from '@/lib/api'
+import { apiPost, isApiError } from '@/lib/api'
 import NicoTagListPage from '@/pages/tags/NicoTagListPage'
 import NotFound from '@/pages/NotFound'
 import PostDetailPage from '@/pages/posts/PostDetailPage'
@@ -61,8 +60,8 @@ export default (() => {
 	  }
 	  catch (err)
 	  {
-	    if (axios.isAxiosError (err))
-	      setStatus (err.status ?? 200)
+	    if (isApiError (err))
+	      setStatus (err.response?.status ?? 200)
 	  }
 	}) ()
       }
diff --git a/frontend/src/lib/api.ts b/frontend/src/lib/api.ts
index 57990c9..0911a6e 100644
--- a/frontend/src/lib/api.ts
+++ b/frontend/src/lib/api.ts
@@ -3,6 +3,8 @@ import toCamel from 'camelcase-keys'
 
 import { API_BASE_URL } from '@/config'
 
+import type { AxiosError } from 'axios'
+
 type Opt = {
     params?:        Record<string, unknown>
     headers?:       Record<string, string>
@@ -64,3 +66,7 @@ export const apiDelete = async (
 ): Promise<void> => {
   await client.delete (path, withUserCode (opt))
 }
+
+
+export const isApiError = (err: unknown): err is AxiosError =>
+    axios.isAxiosError (err)
diff --git a/frontend/src/pages/wiki/WikiSearchPage.tsx b/frontend/src/pages/wiki/WikiSearchPage.tsx
index dda152f..03c9d5b 100644
--- a/frontend/src/pages/wiki/WikiSearchPage.tsx
+++ b/frontend/src/pages/wiki/WikiSearchPage.tsx
@@ -1,4 +1,4 @@
-import React, { useEffect, useState } from 'react'
+import { useEffect, useState } from 'react'
 import { Helmet } from 'react-helmet-async'
 
 import PrefetchLink from '@/components/PrefetchLink'
@@ -7,6 +7,8 @@ import MainArea from '@/components/layout/MainArea'
 import { SITE_TITLE } from '@/config'
 import { apiGet } from '@/lib/api'
 
+import type { FormEvent } from 'react'
+
 import type { WikiPage } from '@/types'
 
 
@@ -19,7 +21,7 @@ export default () => {
     setResults (await apiGet ('/wiki', { params: { title } }))
   }
 
-  const handleSearch = (ev: React.FormEvent) => {
+  const handleSearch = (ev: FormEvent) => {
     ev.preventDefault ()
     search ()
   }