diff --git a/main.go b/main.go
index 6e5a5e2..047e8e1 100644
--- a/main.go
+++ b/main.go
@@ -20,6 +20,7 @@ func main() {
 	case "run_command":
 		commands.RunCommand()
 	default: 
-		fmt.Println("Command not found: %s\n", os.Args[1])
+		fmt.Fprintf(os.Stderr, "Command not found: %s\n", os.Args[1])
+		os.Exit(1)
 	}
 }