The vote, held after three days of energetic debate between uniformed soldiers and elected MPs, saw parliament shoot down a draft amendment that would have chipped away at the military's political stranglehold.
The amendment bill was "not enacted", parliament speaker Shwe Mann told the legislature after the 388 votes in favour of change fell below the threshold of 75 per cent of all lawmakers needed for it to pass.
Suu Kyi this week said "genuine change" in Myanmar was dependant on constitutional change, as she ramped up her rhetoric in a bid to swing the vote before elections slated for October or November.
The key clause under consideration was 436, which calls for a 75 per cent majority in votes on major constitutional changes, ensuring that unelected soldiers have the final say.
