diff --git a/connectors/dds4ccm/impl/dds4ccm_event_connector_t.cpp b/connectors/dds4ccm/impl/dds4ccm_event_connector_t.cpp
index 47a4bdd5..e7ce3c0b 100644
--- a/connectors/dds4ccm/impl/dds4ccm_event_connector_t.cpp
+++ b/connectors/dds4ccm/impl/dds4ccm_event_connector_t.cpp
@@ -308,8 +308,7 @@ DDS_Event_Connector_T<CCM_TYPE, TOPIC_TYPE, TOPIC_SEQ_TYPE>::do_ccm_activate ()
 
     this->pull_consumer_->activate (
       event_strategy_type (this->context ()),
-      this->context ()->get_connection_pull_consumer_status (),
-      nullptr);
+      this->context ()->get_connection_pull_consumer_status ());
   }
 }
 
diff --git a/connectors/dds4ccm/impl/dds4ccm_state_connector_t.cpp b/connectors/dds4ccm/impl/dds4ccm_state_connector_t.cpp
index 1edc9534..09fefd02 100644
--- a/connectors/dds4ccm/impl/dds4ccm_state_connector_t.cpp
+++ b/connectors/dds4ccm/impl/dds4ccm_state_connector_t.cpp
@@ -504,8 +504,7 @@ DDS_State_Connector_T<CCM_TYPE, TOPIC_TYPE, TOPIC_SEQ_TYPE>::do_ccm_activate ()
 
     this->passive_observer_->activate (
       event_strategy_type (this->context ()),
-      this->context ()->get_connection_passive_observer_status (),
-      nullptr);
+      this->context ()->get_connection_passive_observer_status ());
   }
 
   if (this->pull_observer_)
@@ -514,8 +513,7 @@ DDS_State_Connector_T<CCM_TYPE, TOPIC_TYPE, TOPIC_SEQ_TYPE>::do_ccm_activate ()
 
     this->pull_observer_->activate (
       event_strategy_type (this->context ()),
-      this->context ()->get_connection_pull_observer_status (),
-      nullptr);
+      this->context ()->get_connection_pull_observer_status ());
   }
 
   if (this->push_observer_)
diff --git a/connectors/dds4ccm/impl/dds4ccm_subscriber_base_t.h b/connectors/dds4ccm/impl/dds4ccm_subscriber_base_t.h
index 39bb968c..7630dcf2 100644
--- a/connectors/dds4ccm/impl/dds4ccm_subscriber_base_t.h
+++ b/connectors/dds4ccm/impl/dds4ccm_subscriber_base_t.h
@@ -62,7 +62,7 @@ class DDS_Subscriber_Base_T
   virtual void activate (
     const typename CCM_TYPE::event_strategy_type &evs,
     IDL::traits<CCM_DDS::PortStatusListener>::ref_type status,
-    IDL::traits<CORBA::Object>::ref_type);
+    IDL::traits<CORBA::Object>::ref_type = nullptr);
 
   virtual void passivate ();