layout_alignParentBottom not working

[bubu333gh]

Here's my code:

<FlowTextView android:id="@+id/description" android:layout_width="match_parent" android:layout_height="wrap_content">

                    <ImageView
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_alignParentRight="true"
                        android:layout_alignParentEnd="true"
                        android:layout_alignParentBottom="true"
                        android:src="@drawable/fab_placeholder"
                        android:background="@color/primary_light"/>

                </uk.co.deanwild.flowtextview.FlowTextView>

The image is layed out to the upper right corner despite android:layout_alignParentBottom="true"