diff --git a/usr/local/www/pkg_edit.php b/usr/local/www/pkg_edit.php
index c5187ef252..3eb80e46e4 100755
--- a/usr/local/www/pkg_edit.php
+++ b/usr/local/www/pkg_edit.php
@@ -198,7 +198,7 @@ if ($_POST) {
 				$fieldname  = $fields['fieldname'];
 				if ($fieldname == "interface_array") {
 					$fieldvalue = $_POST[$fieldname];
-				} elseif (is_array($fieldvalue)) {
+				} elseif (is_array($_POST[$fieldname])) {
 					$fieldvalue = implode(',', $_POST[$fieldname]);
 				} else {
 					$fieldvalue = trim($_POST[$fieldname]);