diff --git a/Database/ContentIdentifier.hs b/Database/ContentIdentifier.hs
index 0508a386e1..da7f9545de 100644
--- a/Database/ContentIdentifier.hs
+++ b/Database/ContentIdentifier.hs
@@ -10,6 +10,7 @@
 {-# LANGUAGE OverloadedStrings, GADTs, FlexibleContexts, EmptyDataDecls #-}
 {-# LANGUAGE MultiParamTypeClasses, GeneralizedNewtypeDeriving #-}
 {-# LANGUAGE RankNTypes #-}
+{-# LANGUAGE DataKinds, FlexibleInstances #-}
 {-# LANGUAGE UndecidableInstances #-}
 #if MIN_VERSION_persistent_template(2,8,0)
 {-# LANGUAGE DerivingStrategies #-}
diff --git a/Database/Export.hs b/Database/Export.hs
index 1eba4dd401..99a481703e 100644
--- a/Database/Export.hs
+++ b/Database/Export.hs
@@ -10,6 +10,7 @@
 {-# LANGUAGE OverloadedStrings, GADTs, FlexibleContexts #-}
 {-# LANGUAGE MultiParamTypeClasses, GeneralizedNewtypeDeriving #-}
 {-# LANGUAGE RankNTypes #-}
+{-# LANGUAGE DataKinds, FlexibleInstances #-}
 {-# LANGUAGE UndecidableInstances #-}
 #if MIN_VERSION_persistent_template(2,8,0)
 {-# LANGUAGE DerivingStrategies #-}
diff --git a/Database/Fsck.hs b/Database/Fsck.hs
index 528f3a0078..c1e9841978 100644
--- a/Database/Fsck.hs
+++ b/Database/Fsck.hs
@@ -9,6 +9,7 @@
 {-# LANGUAGE QuasiQuotes, TypeFamilies, TemplateHaskell #-}
 {-# LANGUAGE OverloadedStrings, GADTs, FlexibleContexts #-}
 {-# LANGUAGE MultiParamTypeClasses, GeneralizedNewtypeDeriving #-}
+{-# LANGUAGE DataKinds, FlexibleInstances #-}
 {-# LANGUAGE RankNTypes #-}
 {-# LANGUAGE UndecidableInstances #-}
 #if MIN_VERSION_persistent_template(2,8,0)
diff --git a/Database/Keys/SQL.hs b/Database/Keys/SQL.hs
index f96433b36b..26108b1965 100644
--- a/Database/Keys/SQL.hs
+++ b/Database/Keys/SQL.hs
@@ -10,6 +10,7 @@
 {-# LANGUAGE OverloadedStrings, GADTs, FlexibleContexts #-}
 {-# LANGUAGE MultiParamTypeClasses, GeneralizedNewtypeDeriving #-}
 {-# LANGUAGE RankNTypes, ScopedTypeVariables #-}
+{-# LANGUAGE DataKinds, FlexibleInstances #-}
 {-# LANGUAGE UndecidableInstances #-}
 #if MIN_VERSION_persistent_template(2,8,0)
 {-# LANGUAGE DerivingStrategies #-}