diff --git a/sample_app/src/main/java/uk/co/alt236/btlescan/ui/control/DeviceControlActivity.java b/sample_app/src/main/java/uk/co/alt236/btlescan/ui/control/DeviceControlActivity.java
index 96ace50..bce6683 100644
--- a/sample_app/src/main/java/uk/co/alt236/btlescan/ui/control/DeviceControlActivity.java
+++ b/sample_app/src/main/java/uk/co/alt236/btlescan/ui/control/DeviceControlActivity.java
@@ -79,7 +79,7 @@ public class DeviceControlActivity extends AppCompatActivity {
         @Override
         public boolean onChildClick(final ExpandableListView parent, final View v, final int groupPosition, final int childPosition, final long id) {
             final GattDataAdapterFactory.GattDataAdapter adapter =
-                    (GattDataAdapterFactory.GattDataAdapter) parent.getAdapter();
+                    (GattDataAdapterFactory.GattDataAdapter) parent.getExpandableListAdapter();
 
             final BluetoothGattCharacteristic characteristic =
                     adapter.getBluetoothGattCharacteristic(groupPosition, childPosition);