diff --git a/tiramisu/option/netmaskoption.py b/tiramisu/option/netmaskoption.py
index ce6e74c..cc7af39 100644
--- a/tiramisu/option/netmaskoption.py
+++ b/tiramisu/option/netmaskoption.py
@@ -84,7 +84,7 @@ class NetmaskOption(StrOption):
         val_netmask, val_ip = vals
         opt_netmask, opt_ip = opts
         ip = ip_interface('{0}/{1}'.format(val_ip, val_netmask))
-        if not _cidr and current_opt == opt_ip
+        if not _cidr and current_opt == opt_ip:
             if ip.ip == ip.network.network_address:
                 raise ValueError( _('this is a network with netmask "{0}" ("{1}")'
                                     '').format(val_netmask,
@@ -100,5 +100,5 @@ class NetmaskOption(StrOption):
                                               opt_ip.impl_get_display_name()))
             elif ip.ip == ip.network.broadcast_address:
                 raise ValueError(_('IP "{0}" ("{1}") is the broadcast'
-                                   '')format(val_ip,
-                                             opt_ip.impl_get_display_name()))
+                                   '').format(val_ip,
+                                              opt_ip.impl_get_display_name()))