diff --git a/dnsmasq-dhcpd-dynamic/smd.py b/dnsmasq-dhcpd-dynamic/smd.py
index 0c3bc51..579370a 100644
--- a/dnsmasq-dhcpd-dynamic/smd.py
+++ b/dnsmasq-dhcpd-dynamic/smd.py
@@ -11,9 +11,13 @@ def getSMD(url):
     return data
 
 def getNID(c_data, xname):
+    if 'node_prefix' in os.environ:
+        node_prefix = os.environ['node_prefix']
+    else:
+        node_prefix="nid"
     for c in c_data:
         if xname == c['ID']:
-            return 'nid'+'%0*d' % (3, c['NID'])
+            return node_prefix+'%0*d' % (3, c['NID'])
     else:
         return None