diff --git a/classes/local/utils.php b/classes/local/utils.php
index d36ba83..32e723d 100644
--- a/classes/local/utils.php
+++ b/classes/local/utils.php
@@ -160,9 +160,9 @@ public static function get_wireless_interface_name() {
      * @return string converted
      */
     public static function convert_hex_string($string) {
-    return preg_replace_callback('#\\\\x([[:xdigit:]]{2})#ism', function($matches) {
-        return chr(hexdec($matches[1]));
-    }, $string);
-}
+        return preg_replace_callback('#\\\\x([[:xdigit:]]{2})#ism', function($matches) {
+            return chr(hexdec($matches[1]));
+        }, $string);
+    }
 
 }