diff --git a/packages/core/cli/commands/build.mjs b/packages/core/cli/commands/build.mjs
index 29492dd..825384c 100644
--- a/packages/core/cli/commands/build.mjs
+++ b/packages/core/cli/commands/build.mjs
@@ -11,7 +11,7 @@ import {
   prerender,
 } from 'nitropack'
 import { fileURLToPath } from 'node:url'
-import { getNitroConfig } from '../../get-nitro-config.js'
+import { getMcFlyConfig, getNitroConfig } from '../../get-nitro-config.js'
 import { copyFileSync } from 'node:fs'
 
 async function _build(args) {
@@ -19,7 +19,8 @@ async function _build(args) {
   try {
     const rootDir = resolve(args.dir || args._dir || '.')
 
-    const nitroConfig = await getNitroConfig()
+    const [mcflyConfig, appConfigFile] = await getMcFlyConfig()
+    const nitroConfig = await getNitroConfig(mcflyConfig)
 
     console.log('>>> preset arg', args.preset)
 
@@ -41,6 +42,8 @@ async function _build(args) {
       handler: resolve(__dirname, '../../route-middleware.js'),
     })
 
+    nitro.options.runtimeConfig.appConfigFile = appConfigFile
+
     nitro.hooks.hook('compiled', () => {
       console.log('>>> Nitro compiled', rootDir)
 
diff --git a/packages/core/cli/commands/prepare.mjs b/packages/core/cli/commands/prepare.mjs
index 4dcb0b6..15f7563 100755
--- a/packages/core/cli/commands/prepare.mjs
+++ b/packages/core/cli/commands/prepare.mjs
@@ -4,7 +4,7 @@ import { consola } from 'consola'
 import { defineCommand } from 'citty'
 import { resolve } from 'pathe'
 import { createNitro, writeTypes } from 'nitropack'
-import { getNitroConfig } from '../../get-nitro-config.js'
+import { getMcFlyConfig, getNitroConfig } from '../../get-nitro-config.js'
 
 async function prepare(args) {
   consola.start('Preparing McFly workspace...')
@@ -13,7 +13,8 @@ async function prepare(args) {
 
   try {
     const rootDir = resolve(args.dir || args._dir || '.')
-    const nitroConfig = await getNitroConfig()
+    const [mcflyConfig] = await getMcFlyConfig()
+    const nitroConfig = await getNitroConfig(mcflyConfig)
     const nitro = await createNitro({ rootDir, ...nitroConfig })
 
     await writeTypes(nitro)
diff --git a/packages/core/cli/commands/serve.mjs b/packages/core/cli/commands/serve.mjs
index d8d51af..fc4767f 100644
--- a/packages/core/cli/commands/serve.mjs
+++ b/packages/core/cli/commands/serve.mjs
@@ -14,7 +14,7 @@ import {
 import { resolve } from 'pathe'
 import { fileURLToPath } from 'node:url'
 import { dirname } from 'pathe'
-import { getNitroConfig } from '../../get-nitro-config.js'
+import { getMcFlyConfig, getNitroConfig } from '../../get-nitro-config.js'
 
 const hmrKeyRe = /^runtimeConfig\.|routeRules\./
 const __filename = fileURLToPath(import.meta.url)
@@ -57,7 +57,8 @@ async function serve(args) {
         await nitro.close()
       }
 
-      const nitroConfig = await getNitroConfig()
+      const [mcflyConfig, appConfigFile] = await getMcFlyConfig()
+      const nitroConfig = await getNitroConfig(mcflyConfig)
 
       // create new nitro
       nitro = await createNitro(
@@ -91,6 +92,7 @@ async function serve(args) {
         }
       )
       nitro.hooks.hookOnce('restart', reload)
+      nitro.options.runtimeConfig.appConfigFile = appConfigFile
 
       nitro.options.handlers.push({
         middleware: true,
diff --git a/packages/core/get-nitro-config.js b/packages/core/get-nitro-config.js
index c6c0ab5..fffd42b 100644
--- a/packages/core/get-nitro-config.js
+++ b/packages/core/get-nitro-config.js
@@ -8,18 +8,24 @@ import { mcflyNitroConfig } from './mcfly-nitro-config.js'
 /**
  * @returns {Promise<NitroConfig>}
  */
-export async function getNitroConfig() {
+export async function getNitroConfig(mcflyConfig = {}) {
   const { config: nitroConfig } = await loadConfig({ name: 'nitro' })
-  const { config: mcflyConfig } = await loadConfig({ name: 'mcfly' })
-
   return {
-    // nitro config within user's mcfly.config.mjs
-    ...(mcflyConfig.nitro ?? {}),
+    // nitro config in mcfly config
+    ...mcflyConfig.nitro,
 
-    // nitro config from nitro.config.mjs
+    // nitro config from nitro config
     ...(nitroConfig ?? {}),
 
     // McFly standard nitro config
     ...mcflyNitroConfig,
   }
 }
+
+export async function getMcFlyConfig() {
+  const { config: mcflyConfig, configFile } = await loadConfig({
+    name: 'mcfly',
+  })
+
+  return [mcflyConfig, configFile]
+}
diff --git a/packages/core/route-middleware.js b/packages/core/route-middleware.js
index 9665cf3..1aed729 100644
--- a/packages/core/route-middleware.js
+++ b/packages/core/route-middleware.js
@@ -3,7 +3,7 @@ import { useStorage } from 'nitropack/runtime'
 import { createHooks } from 'hookable'
 import { consola } from 'consola'
 import { colorize } from 'consola/utils'
-import { resolve } from 'pathe'
+import { useRuntimeConfig } from 'nitropack/runtime'
 
 import {
   hooks as mcflyHooks,
@@ -28,10 +28,9 @@ export default eventHandler(async (event) => {
   const hooks = createHooks()
   Object.keys(mcflyHooks).forEach((hookName) => hooks.addHooks(hookName))
   const { path } = event
+  const { appConfigFile } = useRuntimeConfig()
 
-  // TODO: detect config file type
-  const mcflyConfigPath = resolve('./mcfly.config.mjs')
-  let { default: configFn } = await import(mcflyConfigPath)
+  let { default: configFn } = await import(appConfigFile)
   let config = configFn()
   const storage = useStorage()