diff --git a/cccli/command/connection.py b/cccli/command/connection.py
index 92c7b45ed51b27189ecafa14b8386a22a467a069..189f9b59d35cfe4bbdda97018bb1dca4cf593c08 100644
--- a/cccli/command/connection.py
+++ b/cccli/command/connection.py
@@ -33,6 +33,8 @@ class Command_whoami(Command):
     '''Show connection login'''
 
     def __call__(self, argv):
+        if len(argv) != 1:
+            raise cmdBadArgument()
         self.printer.out(self.cli.settings["login"])