diff --git a/Yesod/Form/Fields.hs b/Yesod/Form/Fields.hs
--- a/Yesod/Form/Fields.hs
+++ b/Yesod/Form/Fields.hs
@@ -587,7 +587,7 @@
             flip mapM_ opts $ \opt -> inside
                 theId
                 name
-                attrs
+                ((if isReq then (("required", "required"):) else id) attrs)
                 (optionExternalValue opt)
                 ((render opts val) == optionExternalValue opt)
                 (optionDisplay opt)
diff --git a/yesod-form.cabal b/yesod-form.cabal
--- a/yesod-form.cabal
+++ b/yesod-form.cabal
@@ -1,5 +1,5 @@
 name:            yesod-form
-version:         1.3.4
+version:         1.3.4.1
 license:         MIT
 license-file:    LICENSE
 author:          Michael Snoyman <michael@snoyman.com>