Remote OS Fingerprinting is becoming more and more important, not only for security pen-testers,but for the black-hat. Just because Nmap is getting popularity as the tool for guessing which OS is running in a remote system, some security tools have been developed to fake Nmap in its OS Fingerprinting purpose. This document describes a solution to defeat Nmap and behave like another chosen operating system, as well as a demonstration on how can be accomplished.