diff --git a/src/components/room/RoomChatPanel.tsx b/src/components/room/RoomChatPanel.tsx
index 7a19e5b..e27cc18 100644
--- a/src/components/room/RoomChatPanel.tsx
+++ b/src/components/room/RoomChatPanel.tsx
@@ -3,6 +3,7 @@ import { useRoom, type MessageWithMeta } from '@/contexts';
 import { type RoomAiConfig } from '@/contexts/room-context';
 import { useRoomDraft } from '@/hooks/useRoomDraft';
 import { useMentionState } from '@/lib/mention-state';
+import { cn } from '@/lib/utils';
 import { Button } from '@/components/ui/button';
 import { buildMentionHtml } from '@/lib/mention-ast';
 import { MentionInput } from './MentionInput';