- wp_redirect( 'update.php?action=activate-plugin&failure=true&plugin=' . $plugin . '&_wpnonce=' . $_GET['_wpnonce'] );
- activate_plugin( $plugin, '', ! empty( $_GET['networkwide'] ) );
- wp_redirect( 'update.php?action=activate-plugin&success=true&plugin=' . $plugin . '&_wpnonce=' . $_GET['_wpnonce'] );
+ wp_redirect( admin_url('update.php?action=activate-plugin&failure=true&plugin=' . $plugin . '&_wpnonce=' . $_GET['_wpnonce']) );
+ activate_plugin( $plugin, '', ! empty( $_GET['networkwide'] ), true );
+ wp_redirect( admin_url('update.php?action=activate-plugin&success=true&plugin=' . $plugin . '&_wpnonce=' . $_GET['_wpnonce']) );