diff --git a/nonebot/command/__init__.py b/nonebot/command/__init__.py
index d5a7a42f..62779121 100644
--- a/nonebot/command/__init__.py
+++ b/nonebot/command/__init__.py
@@ -76,6 +76,9 @@ class Command:
                 # fallback to command-level args_parser_func
                 if self.args_parser_func:
                     await self.args_parser_func(session)
+                elif session.current_key is not None:
+                    # no args_parser_func, fallback to default behavior
+                    await argfilter.run_arg_filters(session, [])
 
             await self.func(session)
             return True