diff --git a/packages/next/src/server/lib/router-server.ts b/packages/next/src/server/lib/router-server.ts
index fc9dfd76a0678..ef46b9d1f949c 100644
--- a/packages/next/src/server/lib/router-server.ts
+++ b/packages/next/src/server/lib/router-server.ts
@@ -46,6 +46,7 @@ import {
   type AppIsrManifestAction,
 } from '../dev/hot-reloader-types'
 import { normalizedAssetPrefix } from '../../shared/lib/normalized-asset-prefix'
+import { NEXT_PATCH_SYMBOL } from './patch-fetch'
 
 const debug = setupDebug('next:router-server:main')
 const isNextFont = (pathname: string | null) =>
@@ -111,6 +112,8 @@ export async function initialize(opts: {
 
   let devBundlerService: DevBundlerService | undefined
 
+  let originalFetch = globalThis.fetch
+
   if (opts.dev) {
     const { Telemetry } =
       require('../../telemetry/storage') as typeof import('../../telemetry/storage')
@@ -123,6 +126,12 @@ export async function initialize(opts: {
     const { setupDevBundler } =
       require('./router-utils/setup-dev-bundler') as typeof import('./router-utils/setup-dev-bundler')
 
+    const resetFetch = () => {
+      global.fetch = originalFetch
+      // @ts-ignore
+      global[NEXT_PATCH_SYMBOL] = false
+    }
+
     const setupDevBundlerSpan = opts.startServerSpan
       ? opts.startServerSpan.traceChild('setup-dev-bundler')
       : trace('setup-dev-bundler')
@@ -140,6 +149,7 @@ export async function initialize(opts: {
         turbo: !!process.env.TURBOPACK,
         port: opts.port,
         onCleanup: opts.onCleanup,
+        resetFetch,
       })
     )
 
@@ -593,12 +603,12 @@ export async function initialize(opts: {
   let requestHandler: WorkerRequestHandler = requestHandlerImpl
   if (config.experimental.testProxy) {
     // Intercept fetch and other testmode apis.
-    const {
-      wrapRequestHandlerWorker,
-      interceptTestApis,
-    } = require('next/dist/experimental/testmode/server')
+    const { wrapRequestHandlerWorker, interceptTestApis } =
+      require('next/dist/experimental/testmode/server') as typeof import('next/src/experimental/testmode/server')
     requestHandler = wrapRequestHandlerWorker(requestHandler)
     interceptTestApis()
+    // We treat the intercepted fetch as "original" fetch that should be reset to during HMR.
+    originalFetch = globalThis.fetch
   }
   requestHandlers[opts.dir] = requestHandler
 
diff --git a/packages/next/src/server/lib/router-utils/setup-dev-bundler.ts b/packages/next/src/server/lib/router-utils/setup-dev-bundler.ts
index 09fddf90adcca..465de90fe8184 100644
--- a/packages/next/src/server/lib/router-utils/setup-dev-bundler.ts
+++ b/packages/next/src/server/lib/router-utils/setup-dev-bundler.ts
@@ -89,7 +89,6 @@ import { normalizeMetadataPageToRoute } from '../../../lib/metadata/get-metadata
 import { createEnvDefinitions } from '../experimental/create-env-definitions'
 import { JsConfigPathsPlugin } from '../../../build/webpack/plugins/jsconfig-paths-plugin'
 import { store as consoleStore } from '../../../build/output/store'
-import { NEXT_PATCH_SYMBOL } from '../patch-fetch'
 
 export type SetupOpts = {
   renderServer: LazyRenderServerInstance
@@ -105,6 +104,7 @@ export type SetupOpts = {
   nextConfig: NextConfigComplete
   port: number
   onCleanup: (listener: () => Promise<void>) => void
+  resetFetch: () => void
 }
 
 export type ServerFields = {
@@ -154,7 +154,7 @@ export async function propagateServerField(
 }
 
 async function startWatcher(opts: SetupOpts) {
-  const { nextConfig, appDir, pagesDir, dir } = opts
+  const { nextConfig, appDir, pagesDir, dir, resetFetch } = opts
   const { useFileSystemPublicRoutes } = nextConfig
   const usingTypeScript = await verifyTypeScript(opts)
 
@@ -183,13 +183,6 @@ async function startWatcher(opts: SetupOpts) {
     logging: nextConfig.logging !== false,
   })
 
-  const originalFetch = global.fetch
-  const resetFetch = () => {
-    global.fetch = originalFetch
-    // @ts-ignore
-    global[NEXT_PATCH_SYMBOL] = false
-  }
-
   const hotReloader: NextJsHotReloaderInterface = opts.turbo
     ? await createHotReloaderTurbopack(opts, serverFields, distDir, resetFetch)
     : new HotReloaderWebpack(opts.dir, {
@@ -202,7 +195,7 @@ async function startWatcher(opts: SetupOpts) {
         telemetry: opts.telemetry,
         rewrites: opts.fsChecker.rewrites,
         previewProps: opts.fsChecker.prerenderManifest.preview,
-        resetFetch: resetFetch,
+        resetFetch,
       })
 
   await hotReloader.start()