diff --git a/yesod/scaffold/project.hs.cg b/yesod/scaffold/project.hs.cg
index a7c76af1..dbaae5d5 100644
--- a/yesod/scaffold/project.hs.cg
+++ b/yesod/scaffold/project.hs.cg
@@ -28,6 +28,7 @@ main = do
 data ArgConfig = ArgConfig {environment :: String, port :: Int}
                  deriving (Show, Data, Typeable)
 
+argConfig :: ArgConfig
 argConfig = ArgConfig{ environment = def 
   &= help ("application environment, one of: " ++ (foldl1 (\a b -> a ++ ", " ++ b) environments))
   &= typ "ENVIRONMENT"