French grocery retailer Guyenne et Gascogne has said its third-quarter sales slid 1.5% due to tough conditions in the domestic market over the summer.

The company said sales in the three-month period to end-September dropped to €385.1m (US$450.0m), while nine-month sales rose 0.5% to €993.8m.

The family-run company backed its target of a rise of around 20% in full-year net profit.

Guyenne et Gascogne said “exceptional economic conditions” in France in July and August had dented sales, but that activity returned to normal in September, reported Reuters.