diff --git a/lib/classes/p4field.class.php b/lib/classes/p4field.class.php
index cb7b97074d..a734f9cda2 100644
--- a/lib/classes/p4field.class.php
+++ b/lib/classes/p4field.class.php
@@ -3,18 +3,18 @@
 class p4field
 {
 
-  public static function isyes($v)
-  {
-    $v = mb_strtolower(trim((string) $v));
+    public static function isyes($v)
+    {
+        $v = mb_strtolower(trim($v));
 
-    return($v == '1' || $v == 'y' || $v == 'yes' || $v == 'o' || $v == 'oui' || $v == 'on' || $v == 'true');
-  }
+        return($v == '1' || $v == 'y' || $v == 'yes' || $v == 'o' || $v == 'oui' || $v == 'on' || $v == 'true');
+    }
 
-  public static function isno($v)
-  {
-    $v = mb_strtolower(trim((string) $v));
+    public static function isno($v)
+    {
+        $v = mb_strtolower(trim($v));
 
-    return($v == '0' || $v == 'n' || $v == 'no' || $v == 'non' || $v = 'off' || $v == 'false');
-  }
+        return($v == '0' || $v == 'n' || $v == 'no' || $v == 'non' || $v = 'off' || $v == 'false');
+    }
 
 }