A company is running a batch data processing application in an Amazon EC2 instance, which requires frequent access to an Amazon DynamoDB table. The company's security policies mandate that all connections to DynamoDB should be private and secure. The company has set up a Gateway VPC Endpoint for DynamoDB in the VPC where the EC2 instance resides. Even though the EC2 instance is configured to be within a private subnet with a NAT gateway for internet access, the traffic from the EC2 to DynamoDB goes through the NAT gateway instead of the Gateway VPC endpoint. What action can a security engineer take to ensure the EC2 instance uses the Gateway VPC Endpoint for DynamoDB?