diff --git a/src/nonebot_plugin_alconna/uniseg/segment.py b/src/nonebot_plugin_alconna/uniseg/segment.py
index 0be969b..a6d7b86 100644
--- a/src/nonebot_plugin_alconna/uniseg/segment.py
+++ b/src/nonebot_plugin_alconna/uniseg/segment.py
@@ -243,7 +243,7 @@ class CustomNode:
     uid: str
     name: str
     time: datetime
-    content: Union[str, list["Segment"], Message]
+    content: Union[str, List[Segment], Message]
 
 
 @dataclass