diff --git a/src/matrix_applicationbot/classes/bot.py b/src/matrix_applicationbot/classes/bot.py
index 9ba5f67..f3b6ead 100644
--- a/src/matrix_applicationbot/classes/bot.py
+++ b/src/matrix_applicationbot/classes/bot.py
@@ -64,7 +64,7 @@ class ApplicationBot:
         body = event.body if hasattr(event, "body") else None
 
         if body:
-            mention = body.split()[0]
+            mention = body.split()[0].lower()
             if mention == "!applicationbot" or mention in self.username:
                 return await self.handle_command(room, sender, body.split(" ", 1)[1])