diff --git a/lib/xmldb/xmldb_index.php b/lib/xmldb/xmldb_index.php
index e8c82d8f733..72eae495653 100644
--- a/lib/xmldb/xmldb_index.php
+++ b/lib/xmldb/xmldb_index.php
@@ -291,14 +291,14 @@ class xmldb_index extends xmldb_object {
         // The fields
         $indexfields = $this->getFields();
         if (!empty($indexfields)) {
-            $result .= 'array(' . "'".  implode("', '", $indexfields) . "')";
+            $result .= "['".  implode("', '", $indexfields) . "']";
         } else {
             $result .= 'null';
         }
         // Hints
         $hints = $this->getHints();
         if (!empty($hints)) {
-            $result .= ', array(' . "'".  implode("', '", $hints) . "')";
+            $result .= ", ['".  implode("', '", $hints) . "']";
         }
 
         // Return result
diff --git a/lib/xmldb/xmldb_key.php b/lib/xmldb/xmldb_key.php
index 0d47aa036d5..c27ef7135ab 100644
--- a/lib/xmldb/xmldb_key.php
+++ b/lib/xmldb/xmldb_key.php
@@ -430,7 +430,7 @@ class xmldb_key extends xmldb_object {
         // The fields
         $keyfields = $this->getFields();
         if (!empty($keyfields)) {
-            $result .= 'array(' . "'".  implode("', '", $keyfields) . "')";
+            $result .= "['".  implode("', '", $keyfields) . "']";
         } else {
             $result .= 'null';
         }
@@ -447,7 +447,7 @@ class xmldb_key extends xmldb_object {
             // The reffields
             $reffields = $this->getRefFields();
             if (!empty($reffields)) {
-                $result .= 'array(' . "'".  implode("', '", $reffields) . "')";
+                $result .= "['".  implode("', '", $reffields) . "']";
             } else {
                 $result .= 'null';
             }