diff --git a/Yesod/Core/Class/Yesod.hs b/Yesod/Core/Class/Yesod.hs
--- a/Yesod/Core/Class/Yesod.hs
+++ b/Yesod/Core/Class/Yesod.hs
@@ -516,7 +516,7 @@
             <h1>Method Not Supported
             <p>Method <code>#{S8.unpack m}</code> not supported
         |]
-    provideRep $ return $ object ["message" .= ("Bad method" :: Text), "method" .= m]
+    provideRep $ return $ object ["message" .= ("Bad method" :: Text), "method" .= TE.decodeUtf8With TEE.lenientDecode m]
 
 asyncHelper :: (url -> [x] -> Text)
          -> [Script (url)]
diff --git a/yesod-core.cabal b/yesod-core.cabal
--- a/yesod-core.cabal
+++ b/yesod-core.cabal
@@ -1,5 +1,5 @@
 name:            yesod-core
-version:         1.2.6.4
+version:         1.2.6.5
 license:         MIT
 license-file:    LICENSE
 author:          Michael Snoyman <michael@snoyman.com>