Android support Toolbar + ActionBarDrawerToggle not changing to arrow

I'm struggling with the toolbar and drawer. I'm trying to make the burger switch to arrow when I'm adding a new fragment to the backstack but there is no way to do it.

Maybe I'm missing something but I could not find a way. Anyone had the same problem?

This is the declaration:

mDrawerToggle = new ActionBarDrawerToggle(
            getActivityCompat(),                    /* host Activity */
            mDrawerLayout,                    /* DrawerLayout object */
            ((BaseActivity) getActivityCompat()).getToolbar(),
            R.string.navigation_drawer_open,  /* "open drawer" description for accessibility */
            R.string.navigation_drawer_close  /* "close drawer" description for accessibility */
    )

This is the function I call when a fragment is added to the back stack

public void setToggleState(boolean isEnabled) {
    if (mDrawerLayout == null)
        return;

    if (isEnabled) {
        mDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED);
        mDrawerToggle.onDrawerStateChanged(DrawerLayout.LOCK_MODE_UNLOCKED);
    } else {
        mDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);
        mDrawerToggle.onDrawerStateChanged(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);
    }
    mDrawerToggle.syncState();
}

I think all you have to do is to delete the third argument. Thus:

mDrawerToggle = new ActionBarDrawerToggle(
     getActivityCompat(),              /* host Activity */
     mDrawerLayout,                    /* DrawerLayout object */
     // ((BaseActivity) getActivityCompat()).getToolbar(), <== delete this argument
     R.string.navigation_drawer_open,  /* "open drawer" description for accessibility */
     R.string.navigation_drawer_close  /* "close drawer" description for accessibility */
    );

May it helps.