diff --git a/src/www/interfaces_lagg.php b/src/www/interfaces_lagg.php
index de8f82bb7..ff18769cc 100644
--- a/src/www/interfaces_lagg.php
+++ b/src/www/interfaces_lagg.php
@@ -61,7 +61,7 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
         if (lagg_inuse($a_laggs[$id]['laggif'])) {
             $input_errors[] = gettext("This LAGG interface cannot be deleted because it is still being used.");
         } else {
-            mwexec_bg("/sbin/ifconfig " . escapeshellarg($a_laggs[$id]['laggif']) . " destroy");
+            mwexecf('/sbin/ifconfig %s destroy', $a_laggs[$id]['laggif']);
             unset($a_laggs[$id]);
             write_config();
             header(url_safe('Location: /interfaces_lagg.php'));