diff --git a/src/lib/apiTypesV2/Subscription.h b/src/lib/apiTypesV2/Subscription.h
index 705721618b..1212226096 100644
--- a/src/lib/apiTypesV2/Subscription.h
+++ b/src/lib/apiTypesV2/Subscription.h
@@ -149,8 +149,9 @@ struct Subject
 *
 * Subscription -
 */
-struct Subscription
+class Subscription
 {
+public:
   std::string   id;
   std::string   description;
   bool          descriptionProvided;
@@ -164,6 +165,10 @@ struct Subscription
   std::string   toJson();
   void          release();
 
+  Subscription():
+    attrsFormat(NGSI_V2_NORMALIZED)
+  {}
+
   ~Subscription();
 };