diff --git a/packages/koishi-core/src/app.ts b/packages/koishi-core/src/app.ts
index 7e068cbf34..7e03810d64 100644
--- a/packages/koishi-core/src/app.ts
+++ b/packages/koishi-core/src/app.ts
@@ -255,13 +255,14 @@ export class App extends Context {
   private _parse(message: string, session: Session, builtin: boolean, terminator = '') {
     // group message should have prefix or appel to be interpreted as a command call
     const { $reply, $prefix, $appel, messageType } = session
-    if (builtin && ($reply || messageType !== 'private' && $prefix === null && !$appel)) return
+    if (builtin && messageType !== 'private' && $prefix === null && !$appel) return
     terminator = escapeRegExp(terminator)
     const name = message.split(new RegExp(`[\\s${terminator}]`), 1)[0]
     const index = name.lastIndexOf('/')
     const command = this.app._commandMap[name.slice(index + 1).toLowerCase()]
     if (!command) return
-    const result = command.parse(message.slice(name.length).trimStart(), terminator)
+    message = message.slice(name.length).trim() + ($reply ? ' ' + $reply.message : '')
+    const result = command.parse(message, terminator)
     return { command, ...result }
   }
 }
diff --git a/packages/koishi-core/src/plugins/suggest.ts b/packages/koishi-core/src/plugins/suggest.ts
index 42f24a856e..af70c81600 100644
--- a/packages/koishi-core/src/plugins/suggest.ts
+++ b/packages/koishi-core/src/plugins/suggest.ts
@@ -91,7 +91,7 @@ Session.prototype.$suggest = function $suggest(this: Session, options: SuggestOp
 export default function apply(ctx: Context) {
   ctx.middleware((session, next) => {
     const { $argv, $reply, $parsed, $prefix, $appel, messageType } = session
-    if ($argv || $reply || messageType !== 'private' && $prefix === null && !$appel) return next()
+    if ($argv || messageType !== 'private' && $prefix === null && !$appel) return next()
     const target = $parsed.split(/\s/, 1)[0].toLowerCase()
     if (!target) return next()
 
@@ -103,7 +103,7 @@ export default function apply(ctx: Context) {
       prefix: Message.COMMAND_SUGGEST_PREFIX,
       suffix: Message.COMMAND_SUGGEST_SUFFIX,
       async apply(suggestion, next) {
-        const newMessage = suggestion + $parsed.slice(target.length)
+        const newMessage = suggestion + $parsed.slice(target.length) + ($reply ? ' ' + $reply.message : '')
         return this.$execute(newMessage, next)
       },
     })