diff --git a/main.py b/main.py
index 87db849..b93a549 100644
--- a/main.py
+++ b/main.py
@@ -49,7 +49,7 @@ async def on_ready():
 
 
 @bot.command()
-async def grant_role(ctx, study_group_name: str, ukco: int):
+async def grant_role(ctx, study_group_name: str, ukco: str):
     """
     Grant a role to the user based on the study group and UKCO.
     :param ctx: The context of the command.
@@ -63,7 +63,7 @@ async def grant_role(ctx, study_group_name: str, ukco: int):
         return
 
     # Check UKCO format
-    if not (1000_0000 < ukco < 9999_9999):
+    if not ukco.isdigit() or not len(ukco) == 8:
         await reply_error(ctx, 'Invalid UKCO format.')
         await reply(ctx, HELP_MESSAGE)
         return