diff --git a/main.py b/main.py
index 90a4fe7..80102ff 100755
--- a/main.py
+++ b/main.py
@@ -247,8 +247,8 @@ def write_dns_reverse_file(api_client):
 
 
         ### Continue with the ipv6 reverse
-        # hack because we do not have the /64 info
-        net = netaddr.IPNetwork(zone['prefix_v6']+"/64")
+        net = netaddr.IPNetwork(zone['prefix_v6']+"/"+str(zone['prefix_v6_length']))
+        print(net)
         net_class = max(((net.prefixlen - 1) // 4) + 1, 1)  
         zone6_name = ".".join(
                 netaddr.IPAddress(net.first).reverse_dns.split('.')[32 - net_class:]
@@ -263,7 +263,6 @@ def write_dns_reverse_file(api_client):
                                   expire=zone['soa']['expire'],
                                   ttl=zone['soa']['ttl'])
 
-        net = netaddr.IPNetwork(zone['prefix_v6']+"/64")
         prefix_length = int((128 - net.prefixlen)/4)
         ptr_records = "\n".join(
             template_ptr.format(hostname=host['hostname']+extension,