According to a report by the Commerce Department, retail sales in the U.S. in may decreased by 0.3% compared with the previous month.
Analysts had predicted an increase of 0.1%.
In April, retail sales were up 0.4%.
Over the last 12 months the index rose by 3.8%.
Excluding car sales, retail sales in may fell by 0.3% after rising 0.4% in April (revised from +0.3%).
Analysts had forecast growth in may increased by 0.2%.