diff --git a/src/OpenFOAM/containers/Lists/ListOps/ListOpsTemplates.C b/src/OpenFOAM/containers/Lists/ListOps/ListOpsTemplates.C
index 1f308edfb6..41e28c3f64 100644
--- a/src/OpenFOAM/containers/Lists/ListOps/ListOpsTemplates.C
+++ b/src/OpenFOAM/containers/Lists/ListOps/ListOpsTemplates.C
@@ -243,6 +243,7 @@ void Foam::uniqueOrder
                 order[n++] = order[i];
             }
         }
+        order[n++] = order[order.size()-1];
         order.setSize(n);
     }
 }