diff --git a/bot.py b/bot.py
index aa65f6e..b609cd0 100755
--- a/bot.py
+++ b/bot.py
@@ -72,10 +72,9 @@ class BotClient(discord.Client):
         return message.content.startswith("%")
 
     async def on_command(self, message: discord.Message):
-        command = message.content.split(" ")[0]
-        match command:
-            case "%calc":
-                reply = await self._calculate(command[1:])
+        match message.content.split(" "):
+            case ["%calc", *args]:
+                reply = await self._calculate(args)
                 await message.reply(content=reply)
             case _:
                 _log.info(f"Unrecognised command {command}")