diff --git a/app/src/main/java/org/ntlab/amaryllis/client/fragment/ListFragment.java b/app/src/main/java/org/ntlab/amaryllis/client/fragment/ListFragment.java
index 552fc74..aa9b44e 100644
--- a/app/src/main/java/org/ntlab/amaryllis/client/fragment/ListFragment.java
+++ b/app/src/main/java/org/ntlab/amaryllis/client/fragment/ListFragment.java
@@ -20,7 +20,7 @@
  * Use the {@link ListFragment#newInstance} factory method to
  * create an instance of this fragment.
  */
-public class ListFragment extends Fragment {
+public class ListFragment extends Fragment implements MyDialogFragment.MyDialog.OnOkClickListener {
 
     // TODO: Rename parameter arguments, choose names that match
     // the fragment initialization parameters, e.g. ARG_ITEM_NUMBER