diff --git a/ecal/core/src/readwrite/ecal_reader_layer.h b/ecal/core/src/readwrite/ecal_reader_layer.h
index c9d11d0947..69ca8cb5cc 100644
--- a/ecal/core/src/readwrite/ecal_reader_layer.h
+++ b/ecal/core/src/readwrite/ecal_reader_layer.h
@@ -37,7 +37,7 @@ namespace eCAL
     std::string                 host_name;
     int32_t                     process_id = 0;
     std::string                 topic_name;
-    uint64_t                    topic_id = 0;
+    Registration::EntityIdT     topic_id = 0;
     Registration::ConnectionPar parameter;
   };