diff --git a/_modules/virtng.py b/_modules/virtng.py
index 0a87e56..a79e5dd 100644
--- a/_modules/virtng.py
+++ b/_modules/virtng.py
@@ -9,6 +9,7 @@
 
 # Import python libs
 from __future__ import absolute_import
+import copy
 import os
 import re
 import sys
@@ -414,7 +415,7 @@
     else:
         overlay = {}
 
-    disklist = __salt__['config.get']('virt:disk', {}).get(profile, default)
+    disklist = copy.deepcopy(__salt__['config.get']('virt:disk', {}).get(profile, default))
     for key, val in overlay.items():
         for i, disks in enumerate(disklist):
             for disk in disks: