diff --git a/dblayeroo.php b/dblayeroo.php
index 4ec3370..1c821eb 100644
--- a/dblayeroo.php
+++ b/dblayeroo.php
@@ -2913,6 +2913,7 @@ class dblayeroo
   /* }}} */
 
   /** Check the values before doing really the modification of the database
+    * @param array $values The values to test
     * @param boolean|null $update if true UPDATE request, else INSERT request
     */
   public function checkValues ($values, $update = false)
@@ -2924,6 +2925,7 @@ class dblayeroo
       $this->DBException ("checkValues fields : ".
         "values provided are not an array", 406);
     }
+    $values = $this->normalize ($values);
     $update = !! $update;
     $errors = array_merge ($this->checkRealTypes ($values, $update),
                            $this->verify ($values, $update));