diff --git a/driver/vm.go b/driver/vm.go
index 9e7bb6fc0..8fbd6d874 100644
--- a/driver/vm.go
+++ b/driver/vm.go
@@ -251,7 +251,7 @@ func (vm *VirtualMachine) Configure(config *HardwareConfig) error {
 			return err
 		}
 
-		disk.CapacityInKB = convertGiBToKiB(config.DiskSize)
+		disk.CapacityInKB = convertMiBToKiB(config.DiskSize)
 
 		confSpec.DeviceChange = []types.BaseVirtualDeviceConfigSpec{
 			&types.VirtualDeviceConfigSpec{
@@ -427,7 +427,7 @@ func addDisk(_ *Driver, devices object.VirtualDeviceList, config *CreateConfig)
 				ThinProvisioned: types.NewBool(config.DiskThinProvisioned),
 			},
 		},
-		CapacityInKB: convertGiBToKiB(config.DiskSize),
+		CapacityInKB: convertMiBToKiB(config.DiskSize),
 	}
 
 	devices.AssignController(disk, controller)
@@ -540,8 +540,8 @@ func (vm *VirtualMachine) addDevice(device types.BaseVirtualDevice) error {
 	return err
 }
 
-func convertGiBToKiB(gib int64) int64 {
-	return gib * 1024 * 1024
+func convertMiBToKiB(mib int64) int64 {
+	return mib * 1024
 }
 
 func (vm *VirtualMachine) AddConfigParams(params map[string]string) error {
diff --git a/iso/builder_acc_test.go b/iso/builder_acc_test.go
index 265d5364a..a1d0ef82a 100644
--- a/iso/builder_acc_test.go
+++ b/iso/builder_acc_test.go
@@ -32,7 +32,7 @@ func defaultConfig() map[string]interface{} {
 		"ssh_password": "jetbrains",
 
 		"vm_name":   commonT.NewVMName(),
-		"disk_size": 2,
+		"disk_size": 2048,
 
 		"communicator": "none", // do not start the VM without any bootable devices
 	}