diff --git a/yesod-form/Yesod/Form/Fields.hs b/yesod-form/Yesod/Form/Fields.hs
index 5fe98d77..a8a537f0 100644
--- a/yesod-form/Yesod/Form/Fields.hs
+++ b/yesod-form/Yesod/Form/Fields.hs
@@ -106,6 +106,10 @@ import Data.Attoparsec.Text (Parser, char, string, digit, skipSpace, endOfInput,
 
 import Yesod.Persist.Core
 
+#if !MIN_VERSION_base(4,8,0)
+import Data.Monoid
+#endif
+
 defaultFormMessage :: FormMessage -> Text
 defaultFormMessage = englishFormMessage