diff --git a/librarian/discord/cogs/pulls.py b/librarian/discord/cogs/pulls.py
index a5b3671..30939a9 100644
--- a/librarian/discord/cogs/pulls.py
+++ b/librarian/discord/cogs/pulls.py
@@ -42,7 +42,7 @@ def __init__(self):
         self.parser = CountArgparser()
 
     @commands.command()
-    async def list(self, ctx: commands.Context, *args: typing.List[str]):
+    async def list(self, ctx: commands.Context, *args: tuple):
         """
         list pull requests merged within a time span