diff --git a/lib/Database/PostgreSQL/Opium.hs b/lib/Database/PostgreSQL/Opium.hs
index 4ac99d0..73826aa 100644
--- a/lib/Database/PostgreSQL/Opium.hs
+++ b/lib/Database/PostgreSQL/Opium.hs
@@ -5,7 +5,7 @@
 module Database.PostgreSQL.Opium
     -- * Connection Management
   ( Connection
-  , ConnectionError
+  , ConnectionError (..)
   , connect
   , close
     -- * Queries
@@ -41,7 +41,7 @@ import Database.PostgreSQL.LibPQ (Result)
 import qualified Data.Text.Encoding as Encoding
 import qualified Database.PostgreSQL.LibPQ as LibPQ
 
-import Database.PostgreSQL.Opium.Connection (Connection, ConnectionError, connect, close, withRawConnection)
+import Database.PostgreSQL.Opium.Connection (Connection, ConnectionError (..), connect, close, withRawConnection)
 import Database.PostgreSQL.Opium.Error (Error (..), ErrorPosition (..))
 import Database.PostgreSQL.Opium.FromField (FromField (..), RawField (..))
 import Database.PostgreSQL.Opium.FromRow (FromRow (..), ColumnTable)