It says the change was largely reflected in the trade balance, led by a higher deficit on trade in goods.
The deficit on trade in goods expanded $1.1 billion in the second quarter to $3.1 billion, as imports increased.
The trade surplus with the United States slipped during the quarter as imports grew more than exports.
A drop in energy exports to the United States largely offset gains in other categories.
Total imports of goods advanced $1.4 billion to $121.3 billion in the second quarter, while total exports of goods edged up $0.2 billion to $118.2 billion.