diff --git a/Yesod/Form/Fields.hs b/Yesod/Form/Fields.hs
--- a/Yesod/Form/Fields.hs
+++ b/Yesod/Form/Fields.hs
@@ -60,6 +60,10 @@
 import Text.Cassius
 import Data.Time (Day, TimeOfDay(..))
 import qualified Text.Email.Validate as Email
+#if MIN_VERSION_email_validate(1, 0, 0)
+import Data.Text.Encoding (encodeUtf8, decodeUtf8With)
+import Data.Text.Encoding.Error (lenientDecode)
+#endif
 import Network.URI (parseURI)
 import Database.Persist (PersistField)
 import Database.Persist.Store (Entity (..))
@@ -291,9 +295,16 @@
 emailField :: RenderMessage master FormMessage => Field sub master Text
 emailField = Field
     { fieldParse = parseHelper $
+#if MIN_VERSION_email_validate(1, 0, 0)
+        \s ->
+            case Email.canonicalizeEmail $ encodeUtf8 s of
+                Just e -> Right $ decodeUtf8With lenientDecode e
+                Nothing -> Left $ MsgInvalidEmail s
+#else
         \s -> if Email.isValid (unpack s)
                 then Right s
                 else Left $ MsgInvalidEmail s
+#endif
     , fieldView = \theId name attrs val isReq -> toWidget [hamlet|
 $newline never
 <input id="#{theId}" name="#{name}" *{attrs} type="email" :isReq:required="" value="#{either id id val}">
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:         1.2.1
+version:         1.2.1.1
 license:         MIT
 license-file:    LICENSE
 author:          Michael Snoyman <michael@snoyman.com>