Android : remove vertical line action bar

i want to remove the signed below line from the action bar, how i can do that?

this is my action bar:

this is my menu.xml file:

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    >

    <item
        android:id="@+id/foo2"
        android:icon="@drawable/foo2"
        android:showAsAction="ifRoom|withText"
        android:title="@string/foo2"/>
    <item
        android:id="@+id/foo"
        android:orderInCategory="100"
        android:showAsAction="always"
        android:title="@string/foo"/>
    <item
        android:id="@+id/foo1"
        android:icon="@drawable/foo1"
        android:showAsAction="ifRoom|withText"
        android:title="@string/foo1"/>

</menu>

thanks in advance