An aerosol-generating device includes a reservoir configured to hold an aerosol-forming substrate, an atomizer configured to atomize the aerosol-forming substrate, and a micropump configured to deliver a fluid. The micropump is between the reservoir and the atomizer, and in fluid connection with the reservoir and the atomizer. The micropump is configured to supply the aerosol-forming substrate from the reservoir to the atomizer. The micropump includes two pump chambers having two separate chamber volumes and two actuators. Each is actuator assigned to one of the two pump chambers for changing a respective chamber volume. The two pump chambers are arranged in parallel and are in fluid connection with a common inlet and a common outlet. The actuators are configured to operate in parallel such that a volume change in each of the two pump chambers occurs simultaneously.