Amazon has secured a new partnership with FedEx to fill delivery gaps after falling out with UPS, Business Insider has learned.

Amazon says the Memphis, Tenn., company will join other third-party partners including United Parcel Service and the U.S. Postal Service that regularly work alongside Amazon’s last-mile delivery network to balance capacity.

FedEx’s new deal comes nearly six years after its express business dropped Amazon, and about four months since archrival UPS cut its Amazon business in half.