diff --git a/app/modules/msc_getter.py b/app/modules/msc_getter.py
index 81bd537..a20b95d 100644
--- a/app/modules/msc_getter.py
+++ b/app/modules/msc_getter.py
@@ -194,12 +194,14 @@ class MSCGetter(niobot.Module):
 
     @niobot.command("msc.cache")
     @niobot.is_owner()
-    async def msc_cache_manager(self, ctx: niobot.Context, operation: str, arg1: str = None):
+    async def msc_cache_manager(self, ctx: niobot.Context, operation, arg1=None):
         """
         MSC Cache manager
 
         Available commands: get, download, remove, clear, list
         """
+        operation: str
+        arg1: str | None
         if operation == "list":
             known = []
             total_size = 0