diff --git a/astrbot/core/platform/sources/aiocqhttp/aiocqhttp_message_event.py b/astrbot/core/platform/sources/aiocqhttp/aiocqhttp_message_event.py
index 74719845f..b218057df 100644
--- a/astrbot/core/platform/sources/aiocqhttp/aiocqhttp_message_event.py
+++ b/astrbot/core/platform/sources/aiocqhttp/aiocqhttp_message_event.py
@@ -28,7 +28,9 @@ class AiocqhttpMessageEvent(AstrMessageEvent):
                 elif segment.file and segment.file.startswith("http"):
                     image_file_path = await download_image_by_url(segment.file)
                     image_base64 = file_to_base64(image_file_path)
-                d['data']['file'] = image_base64
+                d['data'] = {
+                    'file': image_base64,
+                }
             ret.append(d)
         return ret