diff --git a/README.md b/README.md
index ab029b391..64b93dd49 100644
--- a/README.md
+++ b/README.md
@@ -64,6 +64,7 @@ Hardware customization:
 * `RAM` - Amount of RAM in megabytes. Inherited from source VM by default.
 * `RAM_reservation` - Amount of reserved RAM in MB. Inherited from source VM by default.
 * `RAM_reserve_all` - Reserve all available RAM (bool). `false` by default. Cannot be used together with `RAM_reservation`.
+* `disk_size` - Change the disk size (in GB). VM should have a single disk. Cannot be used together with `linked_clone`.
 
 Provisioning:
 * `ssh_username` - [**mandatory**] username in guest OS.
diff --git a/driver/vm.go b/driver/vm.go
index 0457690df..01eab2cd0 100644
--- a/driver/vm.go
+++ b/driver/vm.go
@@ -30,6 +30,7 @@ type HardwareConfig struct {
 	RAM            int64
 	RAMReservation int64
 	RAMReserveAll  bool
+	DiskSize       int64
 }
 
 func (d *Driver) NewVM(ref *types.ManagedObjectReference) *VirtualMachine {
@@ -165,6 +166,27 @@ func (vm *VirtualMachine) Configure(config *HardwareConfig) error {
 
 	confSpec.MemoryReservationLockedToMax = &config.RAMReserveAll
 
+	if config.DiskSize > 0 {
+		devices, err := vm.vm.Device(vm.driver.ctx)
+		if err != nil {
+			return err
+		}
+
+		disk, err := findDisk(devices)
+		if err != nil {
+			return err
+		}
+
+		disk.CapacityInKB = config.DiskSize * 1024 * 1024 // Gb
+
+		confSpec.DeviceChange = []types.BaseVirtualDeviceConfigSpec{
+			&types.VirtualDeviceConfigSpec{
+				Device:    disk,
+				Operation: types.VirtualDeviceConfigSpecOperationEdit,
+			},
+		}
+	}
+
 	task, err := vm.vm.Reconfigure(vm.driver.ctx, confSpec)
 	if err != nil {
 		return err
@@ -173,6 +195,24 @@ func (vm *VirtualMachine) Configure(config *HardwareConfig) error {
 	return err
 }
 
+func findDisk(devices object.VirtualDeviceList) (*types.VirtualDisk, error) {
+	var disks []*types.VirtualDisk
+	for _, device := range devices {
+		switch d := device.(type) {
+		case *types.VirtualDisk:
+			disks = append(disks, d)
+		}
+	}
+
+	switch len(disks) {
+	case 0:
+		return nil, errors.New("VM has no disks")
+	case 1:
+		return disks[0], nil
+	}
+	return nil, errors.New("VM has multiple disks")
+}
+
 func (vm *VirtualMachine) PowerOn() error {
 	task, err := vm.vm.PowerOn(vm.driver.ctx)
 	if err != nil {
diff --git a/step_hardware.go b/step_hardware.go
index f62651045..aaf620b50 100644
--- a/step_hardware.go
+++ b/step_hardware.go
@@ -14,6 +14,7 @@ type HardwareConfig struct {
 	RAM            int64 `mapstructure:"RAM"`
 	RAMReservation int64 `mapstructure:"RAM_reservation"`
 	RAMReserveAll  bool  `mapstructure:"RAM_reserve_all"`
+	DiskSize       int64 `mapstructure:"disk_size"`
 }
 
 func (c *HardwareConfig) Prepare() []error {
@@ -44,6 +45,7 @@ func (s *StepConfigureHardware) Run(state multistep.StateBag) multistep.StepActi
 			RAM:            s.config.RAM,
 			RAMReservation: s.config.RAMReservation,
 			RAMReserveAll:  s.config.RAMReserveAll,
+			DiskSize:       s.config.DiskSize,
 		})
 		if err != nil {
 			state.Put("error", err)