diff --git a/azurerm/resource_arm_virtual_machine_data_disk_attachment.go b/azurerm/resource_arm_virtual_machine_data_disk_attachment.go
index 328f03dd3434..0af6464c1fd8 100644
--- a/azurerm/resource_arm_virtual_machine_data_disk_attachment.go
+++ b/azurerm/resource_arm_virtual_machine_data_disk_attachment.go
@@ -41,25 +41,25 @@ func resourceArmVirtualMachineDataDiskAttachment() *schema.Resource {
 				ValidateFunc: validation.IntAtLeast(0),
 			},
 
-			"create_option": {
+			"caching": {
 				Type:     schema.TypeString,
-				Optional: true,
-				ForceNew: true,
-				Default:  string(compute.DiskCreateOptionTypesAttach),
+				Required: true,
 				ValidateFunc: validation.StringInSlice([]string{
-					string(compute.DiskCreateOptionTypesAttach),
-					string(compute.DiskCreateOptionTypesEmpty),
+					string(compute.CachingTypesNone),
+					string(compute.CachingTypesReadOnly),
+					string(compute.CachingTypesReadWrite),
 				}, true),
 				DiffSuppressFunc: ignoreCaseDiffSuppressFunc,
 			},
 
-			"caching": {
+			"create_option": {
 				Type:     schema.TypeString,
-				Required: true,
+				Optional: true,
+				ForceNew: true,
+				Default:  string(compute.DiskCreateOptionTypesAttach),
 				ValidateFunc: validation.StringInSlice([]string{
-					string(compute.CachingTypesNone),
-					string(compute.CachingTypesReadOnly),
-					string(compute.CachingTypesReadWrite),
+					string(compute.DiskCreateOptionTypesAttach),
+					string(compute.DiskCreateOptionTypesEmpty),
 				}, true),
 				DiffSuppressFunc: ignoreCaseDiffSuppressFunc,
 			},