Elevation not working in Toolbar when a logo is used

Question

The elevation of my toolbar is not working when I use a Logo.

XML of my toolbar:

<android.support.v7.widget.Toolbar
    android:id="@+id/toolbarPrincipal"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/Cor_toolbar"
    android:minHeight="?attr/actionBarSize"
    android:theme="?attr/actionBarTheme"
    android:elevation="5dp"/>

toolbar with Logo

android.support.v7.widget.Toolbar toolbar = findViewById(R.id.toolbarPrincipal);
    toolbar.setLogo(R.drawable.toolbar_logo);
    toolbar.setTitle("");
    setSupportActionBar(toolbar);

But when I don't use a Logo it apears

//Configuração da Toolbar
    android.support.v7.widget.Toolbar toolbar = findViewById(R.id.toolbarPrincipal);
    toolbar.setTitle("Editar Perfil");
    setSupportActionBar(toolbar);

toolbar without Logo