TORONTO _ The Canadian dollar was down about one-tenth of a U.S. cent ahead of the open of trading on North American stock markets.
The loonie traded at 81.04 cents US, down 0.09 of a U.S. cent from Monday's close.
The Dow Jones industrial futures were up 39 points at 18,064.0, the Nasdaq futures rose 12.7 points to 4,545.5, and the S&P 500 futures advanced 5.9 points to 2,118.7.
On the commodity markets, the July crude contract was unchanged at US$59.68 a barrel and the August gold contract fell $4.20 to US$1,179.90 an ounce.
The S&P/TSX composite index closed Monday at 14,790.48, after rising 137.36 points.