func populateLocationConstraint(r *aws.Request) {
	if r.ParamsFilled() && r.Config.Region != "us-east-1" {
		in := r.Params.(*CreateBucketInput)
		if in.CreateBucketConfiguration == nil {
			r.Params = awsutil.CopyOf(r.Params)
			in = r.Params.(*CreateBucketInput)
			in.CreateBucketConfiguration = &CreateBucketConfiguration{
				LocationConstraint: &r.Config.Region,
			}
		}
	}
}