diff --git a/src/etc/inc/interfaces.inc b/src/etc/inc/interfaces.inc
index 4952375b1..723dad2e4 100644
--- a/src/etc/inc/interfaces.inc
+++ b/src/etc/inc/interfaces.inc
@@ -3455,7 +3455,7 @@ function interface_group_setup(&$groupname)
 
     $members = explode(' ', $groupname['members']);
     foreach ($members as $ifs) {
-        mwexec('/sbin/ifconfig %s group %s', array(get_real_interface($ifs), $groupname['ifname']));
+        mwexecf('/sbin/ifconfig %s group %s', array(get_real_interface($ifs), $groupname['ifname']));
     }
 }