diff --git a/gestion/gen_confs/firewall4/utils.py b/gestion/gen_confs/firewall4/utils.py
index afd68eb0..fd8e756b 100644
--- a/gestion/gen_confs/firewall4/utils.py
+++ b/gestion/gen_confs/firewall4/utils.py
@@ -97,7 +97,7 @@ class firewall_tools(object) :
                         bl_ips.add(str(ip))
                     else:
                         for net in nets:
-                            if ip in netaddr.IPNetwork(net):
+                            if ip.value in netaddr.IPNetwork(net):
                                 bl_ips.add(str(ip))
         return bl_ips