diff --git a/packages/cli/src/addons/index.ts b/packages/cli/src/addons/index.ts
index 0eadb44c3b..f28a6e4ea1 100644
--- a/packages/cli/src/addons/index.ts
+++ b/packages/cli/src/addons/index.ts
@@ -5,7 +5,7 @@ import Watcher from './watcher'
 
 declare module 'koishi' {
   interface App {
-    _prolog: string[]
+    prologue: string[]
     watcher: Watcher
   }
 
diff --git a/packages/cli/src/addons/logger.ts b/packages/cli/src/addons/logger.ts
index 56b2a7526a..74387ab63a 100644
--- a/packages/cli/src/addons/logger.ts
+++ b/packages/cli/src/addons/logger.ts
@@ -27,12 +27,12 @@ App.Config.list.push(Schema.object({
   logger: Config,
 }))
 
-let prolog: string[] = []
+let prologue: string[] = []
 
 const target: Logger.Target = {
   colors: 3,
   showTime: 'yyyy-MM-dd hh:mm:ss',
-  print: text => prolog.push(text),
+  print: text => prologue.push(text),
 }
 
 export function prepare(config: Config = {}) {
@@ -77,7 +77,7 @@ export function prepare(config: Config = {}) {
 }
 
 export function apply(app: App) {
-  app._prolog = prolog
+  app.prologue = prologue
   app.on('ready', () => {
     remove(Logger.targets, target)
   })
diff --git a/plugins/frontend/logger/src/index.ts b/plugins/frontend/logger/src/index.ts
index 12c3cf8381..edb46edc49 100644
--- a/plugins/frontend/logger/src/index.ts
+++ b/plugins/frontend/logger/src/index.ts
@@ -65,11 +65,11 @@ class LogProvider extends DataSource<string[]> {
   }
 
   prepareLogger() {
-    if (this.ctx.app._prolog) {
-      for (const line of this.ctx.app._prolog) {
+    if (this.ctx.app.prologue) {
+      for (const line of this.ctx.app.prologue) {
         this.printText(line)
       }
-      this.ctx.app._prolog = null
+      this.ctx.app.prologue = null
     }
 
     const target: Logger.Target = {