diff --git a/xmo-remote-client.py b/xmo-remote-client.py
index 70d6be2..a48184a 100755
--- a/xmo-remote-client.py
+++ b/xmo-remote-client.py
@@ -156,7 +156,7 @@ async def disable_wifi_radio(client: SagemcomClient, radio: Any) -> None:
 
 def validate_mac_address(ctx: click.Context, param: str, value: str) -> str:
     if not re.match(r"([0-9A-F]{2}:){5}[0-9A-F]{2}$", value):
-        raise click.BadParameter("Invalid mac address", param=value)
+        raise click.BadParameter("Invalid MAC address", param=value)
     return value