diff --git a/src/etc/inc/plugins.inc.d/pf.inc b/src/etc/inc/plugins.inc.d/pf.inc
index d671bf91f..83fbbbe84 100644
--- a/src/etc/inc/plugins.inc.d/pf.inc
+++ b/src/etc/inc/plugins.inc.d/pf.inc
@@ -46,8 +46,8 @@ function pf_services()
             'description' => gettext('Interface groups'),
             'nocheck' => true,
             'php' => array(
-                'start' => 'interfaces_group_setup',
-                'restart' => 'interfaces_group_setup',
+                'start' => array('interfaces_group_setup'),
+                'restart' => array('interfaces_group_setup'),
             ),
             'name' => 'ifgroups',
         );