diff --git a/postgresql-binary.cabal b/postgresql-binary.cabal
--- a/postgresql-binary.cabal
+++ b/postgresql-binary.cabal
@@ -1,7 +1,7 @@
 name:
   postgresql-binary
 version:
-  0.12.3
+  0.12.3.1
 synopsis:
   Encoders and decoders for the PostgreSQL's binary format
 description:
diff --git a/tasty/Main/DB.hs b/tasty/Main/DB.hs
--- a/tasty/Main/DB.hs
+++ b/tasty/Main/DB.hs
@@ -8,7 +8,7 @@
 )
 where
 
-import Main.Prelude
+import Main.Prelude hiding (unit)
 import Control.Monad.Trans.Reader
 import Control.Monad.IO.Class
 import qualified Database.PostgreSQL.LibPQ as LibPQ