The Belgians scored two goals in the final 20 minutes on Tuesday as they came from behind to earn a 2-1 win in their Group H opener.
"The first half was very difficult because Algeria played well," De Bruyne told FIFA.com. "We had more spaces in the second half and we worked better to take the win. We were patient, which is something important in these types of games."
Belgium are back in action on Sunday when they meet Russia in Rio de Janeiro.