diff --git a/dblayer.php b/dblayer.php
index fd775d5..dce25e9 100644
--- a/dblayer.php
+++ b/dblayer.php
@@ -375,7 +375,7 @@ class dblayer
                           $key));
           continue;
         }
-        if (strlen ($data[$key]) > $params[1])
+        if (mb_strlen ($data[$key]) > $params[1])
         {
           $errors[$key] = array ("error", sprintf (
                                dgettext("domframework",