Why am I getting permission denied on an ownership change?

My current user is pronto mediapop_staging=> select current_user; current_user -------------- pronto (1 row) This user a standard super user created on AWS RDS. mediapop_staging=> \du pronto List of roles Role name | Attributes | Member of -----------+-------------------------------+----------------- pronto | Create role, Create DB +| {rds_superuser} | Password valid until infinity | But I'm getting this: mediapop_staging=> REASSIGN OWNED BY pronto TO mediapop_staging; ERROR: permission denied to reassign objects Why? How can I resolve it?