Revenue for the quarter was US$334.8mln, while analysts had been expecting US$340.1mln.
Sees second half revenue growth
The adjusted loss per share was 30 US cents versus the 11 US cents expected.
GoPro said that it expects revenue for the first half of 2018 to be lower compared to the first half of 2017.
But it expects to see revenue growth in the second half of the year as it introduces higher margin products.
GoPro shares shed 4.91% to US$5.23.