diff --git a/src/core/model/object-base.cc b/src/core/model/object-base.cc
index 6198756cb..9527d6dda 100644
--- a/src/core/model/object-base.cc
+++ b/src/core/model/object-base.cc
@@ -53,6 +53,7 @@ GetObjectIid (void)
   NS_LOG_FUNCTION_NOARGS ();
   TypeId tid = TypeId ("ns3::ObjectBase");
   tid.SetParent (tid);
+  tid.SetGroupName ("Core");
   return tid;
 }
 
diff --git a/src/internet/model/ipv4-interface.cc b/src/internet/model/ipv4-interface.cc
index 0d99bf46a..bd5978c21 100644
--- a/src/internet/model/ipv4-interface.cc
+++ b/src/internet/model/ipv4-interface.cc
@@ -41,6 +41,7 @@ Ipv4Interface::GetTypeId (void)
 {
   static TypeId tid = TypeId ("ns3::Ipv4Interface")
     .SetParent<Object> ()
+    .SetGroupName ("Internet")
     .AddAttribute ("ArpCache",
                    "The arp cache for this ipv4 interface",
                    PointerValue (0),