diff --git a/packages/next/server/router.ts b/packages/next/server/router.ts
index 26a5168776994..32226b9a3139d 100644
--- a/packages/next/server/router.ts
+++ b/packages/next/server/router.ts
@@ -15,6 +15,7 @@ import { matchHas } from '../shared/lib/router/utils/prepare-destination'
 import { removePathPrefix } from '../shared/lib/router/utils/remove-path-prefix'
 import { getRequestMeta } from './request-meta'
 import { addPathPrefix } from '../shared/lib/router/utils/add-path-prefix'
+import { getNextPathnameInfo } from '../shared/lib/router/utils/get-next-pathname-info'
 
 type RouteResult = {
   finished: boolean
@@ -300,6 +301,21 @@ export default class Router {
         // if it is set
         let currentPathname = parsedUrlUpdated.pathname as string
         const originalPathname = currentPathname
+        const pathnameInfo = getNextPathnameInfo(originalPathname, {
+          nextConfig: this.nextConfig,
+          parseData: false,
+        })
+
+        // don't match API routes when they are locale prefixed
+        // e.g. /api/hello shouldn't match /en/api/hello as a page
+        // rewrites/redirects can match though
+        if (
+          !customRouteTypes.has(testRoute.type) &&
+          pathnameInfo.locale &&
+          pathnameInfo.pathname.match(/^\/api(?:\/|$)/)
+        ) {
+          continue
+        }
 
         const currentPathnameNoBasePath = removePathPrefix(
           currentPathname,
@@ -314,26 +330,10 @@ export default class Router {
           currentPathname = currentPathnameNoBasePath
         }
 
-        const localePathResult = normalizeLocalePath(
-          currentPathnameNoBasePath,
-          this.locales
-        )
-
-        // don't match API routes when they are locale prefixed
-        // e.g. /api/hello shouldn't match /en/api/hello as a page
-        // rewrites/redirects can match though
-        if (
-          !customRouteTypes.has(testRoute.type) &&
-          localePathResult.detectedLocale &&
-          localePathResult.pathname.match(/^\/api(?:\/|$)/)
-        ) {
-          continue
-        }
-
         if (
           customRouteTypes.has(testRoute.type) &&
           !testRoute.internal &&
-          !localePathResult.detectedLocale &&
+          !pathnameInfo.locale &&
           parsedUrl.query.__nextLocale
         ) {
           currentPathname = addPathPrefix(