Namibia had won the toss and restricted Scotland to 109-8 in their 20 overs.
Michael Leask was the top scorer for Scotland with 44 from 27 deliveries. His knock included four boundaries in two sixes.
Chris Greaves made 32-ball 25 with two fours to his name.
Ruben Trumpelmann was the pick of the bowlers with his figures of 3-17 whereas Jan Frylinck got two wickets.
In reply, they chased the 110-run target in 19.1 overs at the loss of six wickets.
Johannes Jonathan Smit top-scored with 32 not out from 23 balls with two boundaries and as many sixes. Opener Craig Williams hit a six on his way to 29-ball 23.
Michael Leask bagged two wickets in the game while Brad Wheal, Safyaan Sharif, Chris Greaves and Mark Watt got a wicket each.