diff --git a/Database/Groundhog/Postgresql.hs b/Database/Groundhog/Postgresql.hs
--- a/Database/Groundhog/Postgresql.hs
+++ b/Database/Groundhog/Postgresql.hs
@@ -3,7 +3,7 @@
     ( withPostgresqlPool
     , withPostgresqlConn
     , runDbConn
-    , Postgresql
+    , Postgresql(..)
     , module Database.Groundhog
     , module Database.Groundhog.Generic.Sql.Functions
     ) where
diff --git a/groundhog-postgresql.cabal b/groundhog-postgresql.cabal
--- a/groundhog-postgresql.cabal
+++ b/groundhog-postgresql.cabal
@@ -1,5 +1,5 @@
 name:            groundhog-postgresql
-version:         0.4.0
+version:         0.4.0.1
 license:         BSD3
 license-file:    LICENSE
 author:          Boris Lykah <lykahb@gmail.com>