diff --git a/share/etc/oned.conf b/share/etc/oned.conf
index bf629e6d32..55bc0203c9 100644
--- a/share/etc/oned.conf
+++ b/share/etc/oned.conf
@@ -115,8 +115,8 @@ FEDERATION = [
 # Default showback cost
 #-------------------------------------------------------------------------------
 # The following attributes define the default cost for Virtual Machines that
-# don't have a CPU or MEMORY cost. This is used by the oneshowback calculate
-# method.
+# don't have a CPU, MEMORY or DISK cost. This is used by the oneshowback
+# calculate method.
 #*******************************************************************************
 
 DEFAULT_COST = [
@@ -785,6 +785,7 @@ VM_RESTRICTED_ATTR = "DISK/READ_IOPS_SEC"
 VM_RESTRICTED_ATTR = "DISK/WRITE_IOPS_SEC"
 VM_RESTRICTED_ATTR = "CPU_COST"
 VM_RESTRICTED_ATTR = "MEMORY_COST"
+VM_RESTRICTED_ATTR = "DISK_COST"
 
 #VM_RESTRICTED_ATTR = "RANK"
 #VM_RESTRICTED_ATTR = "SCHED_RANK"