diff --git a/vcd_cli/disk.py b/vcd_cli/disk.py
index 96b49272..89751557 100644
--- a/vcd_cli/disk.py
+++ b/vcd_cli/disk.py
@@ -95,9 +95,9 @@ def list_disks(ctx):
                 'owner':
                 disk.Owner.User.get('name'),
                 'size':
-                humanfriendly.format_size(int(disk.get('size'))),
+                humanfriendly.format_size(int(disk.get('sizeMb'))),
                 'size_bytes':
-                disk.get('size'),
+                disk.get('sizeMb'),
                 'status':
                 VCLOUD_STATUS_MAP.get(int(disk.get('status'))),
                 'vms_attached':