diff --git a/pkg/model/azuremodel/vmscaleset.go b/pkg/model/azuremodel/vmscaleset.go
index dbf17be76b..7f62b013ca 100644
--- a/pkg/model/azuremodel/vmscaleset.go
+++ b/pkg/model/azuremodel/vmscaleset.go
@@ -192,9 +192,9 @@ func getStorageProfile(spec *kops.InstanceGroupSpec) (*compute.VirtualMachineSca
 	}
 
 	return &compute.VirtualMachineScaleSetStorageProfile{
-		ImageReference: imageReference,
+		DiskControllerType: fi.PtrTo(string(compute.SCSI)),
+		ImageReference:     imageReference,
 		OsDisk: &compute.VirtualMachineScaleSetOSDisk{
-			// TODO(kenji): Support Windows.
 			OsType:       compute.OperatingSystemTypes(compute.Linux),
 			CreateOption: compute.DiskCreateOptionTypesFromImage,
 			DiskSizeGB:   to.Int32Ptr(volumeSize),
diff --git a/pkg/model/azuremodel/vmscaleset_test.go b/pkg/model/azuremodel/vmscaleset_test.go
index 820ae97510..51b94fc4f1 100644
--- a/pkg/model/azuremodel/vmscaleset_test.go
+++ b/pkg/model/azuremodel/vmscaleset_test.go
@@ -154,6 +154,7 @@ func TestGetStorageProfile(t *testing.T) {
 				},
 			},
 			profile: &compute.VirtualMachineScaleSetStorageProfile{
+				DiskControllerType: fi.PtrTo(string(compute.SCSI)),
 				ImageReference: &compute.ImageReference{
 					Publisher: to.StringPtr("Canonical"),
 					Offer:     to.StringPtr("UbuntuServer"),
@@ -177,6 +178,7 @@ func TestGetStorageProfile(t *testing.T) {
 				Role:  kops.InstanceGroupRoleControlPlane,
 			},
 			profile: &compute.VirtualMachineScaleSetStorageProfile{
+				DiskControllerType: fi.PtrTo(string(compute.SCSI)),
 				ImageReference: &compute.ImageReference{
 					Publisher: to.StringPtr("Canonical"),
 					Offer:     to.StringPtr("UbuntuServer"),