diff --git a/apps/t3/app/src/main/java/org/onosproject/t3/api/GroupNib.java b/apps/t3/app/src/main/java/org/onosproject/t3/api/GroupNib.java
index 64d6575..b1fb563 100644
--- a/apps/t3/app/src/main/java/org/onosproject/t3/api/GroupNib.java
+++ b/apps/t3/app/src/main/java/org/onosproject/t3/api/GroupNib.java
@@ -28,7 +28,7 @@
  * and supports alternative functions to
  * {@link org.onosproject.net.group.GroupService} for offline data.
  */
-public class GroupNib {
+public class GroupNib extends AbstractNib {
 
     // TODO with method optimization, store into subdivided structures at the first load
     private Set<Group> groups;