diff --git a/src/firewall/core/io/service.py b/src/firewall/core/io/service.py
index cf343fe..0387b6c 100644
--- a/src/firewall/core/io/service.py
+++ b/src/firewall/core/io/service.py
@@ -96,7 +96,7 @@ class Service(IO_Object):
         conf = {}
         type_formats = dict([(x[0], x[1]) for x in self.IMPORT_EXPORT_STRUCTURE])
         for key in type_formats:
-            if getattr(self, key):
+            if getattr(self, key) or isinstance(getattr(self, key), bool):
                 conf[key] = copy.deepcopy(getattr(self, key))
         return conf