diff --git a/plugins/keychain/keychain.plugin.zsh b/plugins/keychain/keychain.plugin.zsh
index cca7a7f5d..6fdf99e88 100644
--- a/plugins/keychain/keychain.plugin.zsh
+++ b/plugins/keychain/keychain.plugin.zsh
@@ -28,6 +28,9 @@ function keychain() {
       echo "Stopping agent"
       ssh-agent -k >/dev/null && [[ -f $ssh_env ]] && rm $ssh_env
       ;;
+    *)
+      echo "$0: invalid command $1" 2>&1
+      ;;
   esac
 }