diff --git a/form.php b/form.php
index 6ce019b..48f0dd2 100644
--- a/form.php
+++ b/form.php
@@ -1414,6 +1414,7 @@ class formfield
               "'";
     if (isset ($this->readonly) && $this->readonly !== FALSE)
       $res .= " readonly='readonly'";
+    $res .= " class='form-control'";
     if (isset ($this->hidden) && $this->hidden !== FALSE)
       $res .= " style='display:none'";
     if (isset ($this->cols))