diff --git a/website/source/docs/providers/cloudstack/r/disk.html.markdown b/website/source/docs/providers/cloudstack/r/disk.html.markdown
index 208927738..b6e56199c 100644
--- a/website/source/docs/providers/cloudstack/r/disk.html.markdown
+++ b/website/source/docs/providers/cloudstack/r/disk.html.markdown
@@ -19,7 +19,7 @@ resource "cloudstack_disk" "default" {
   attach = "true"
   disk_offering = "custom"
   size = 50
-  virtual-machine = "server-1"
+  virtual_machine = "server-1"
   zone = "zone-1"
 }
 ```