diff --git a/yesod-websockets/sample.hs b/yesod-websockets/sample.hs
index e369a99e..84f88b2e 100644
--- a/yesod-websockets/sample.hs
+++ b/yesod-websockets/sample.hs
@@ -1,4 +1,4 @@
-{-# LANGUAGE QuasiQuotes, TemplateHaskell, TypeFamilies #-}
+{-# LANGUAGE QuasiQuotes, TemplateHaskell, TypeFamilies, OverloadedStrings #-}
 import Yesod.Core
 import Yesod.WebSockets
 import qualified Data.Text.Lazy as TL