diff --git a/persistent-mongoDB/test/EmbedTestMongo.hs b/persistent-mongoDB/test/EmbedTestMongo.hs
index 79643a359..7299ab56d 100644
--- a/persistent-mongoDB/test/EmbedTestMongo.hs
+++ b/persistent-mongoDB/test/EmbedTestMongo.hs
@@ -10,6 +10,7 @@
 {-# LANGUAGE UndecidableInstances #-}
 {-# LANGUAGE DerivingStrategies #-}
 {-# LANGUAGE GeneralizedNewtypeDeriving #-}
+{-# LANGUAGE TypeOperators #-}
 {-# LANGUAGE StandaloneDeriving #-}
 {-# OPTIONS_GHC -Wno-unused-top-binds -Wno-orphans -O0 #-}
 module EmbedTestMongo (specs) where
diff --git a/persistent-mongoDB/test/main.hs b/persistent-mongoDB/test/main.hs
index f35faddb0..bbe9f804b 100644
--- a/persistent-mongoDB/test/main.hs
+++ b/persistent-mongoDB/test/main.hs
@@ -10,6 +10,7 @@
 {-# LANGUAGE StandaloneDeriving #-}
 {-# LANGUAGE TemplateHaskell #-}
 {-# LANGUAGE TypeFamilies #-}
+{-# LANGUAGE TypeOperators #-}
 {-# LANGUAGE UndecidableInstances #-}
 {-# OPTIONS_GHC -Wno-unused-top-binds #-}
 
diff --git a/persistent-mysql/test/main.hs b/persistent-mysql/test/main.hs
index f5c95b0c4..4eeed768e 100644
--- a/persistent-mysql/test/main.hs
+++ b/persistent-mysql/test/main.hs
@@ -10,6 +10,7 @@
 {-# LANGUAGE StandaloneDeriving #-}
 {-# LANGUAGE TemplateHaskell #-}
 {-# LANGUAGE TypeFamilies #-}
+{-# LANGUAGE TypeOperators #-}
 {-# LANGUAGE UndecidableInstances #-}
 
 {-# OPTIONS_GHC -Wno-unused-top-binds #-}
diff --git a/persistent-postgresql/test/ArrayAggTest.hs b/persistent-postgresql/test/ArrayAggTest.hs
index b8902a114..ac1f6e42d 100644
--- a/persistent-postgresql/test/ArrayAggTest.hs
+++ b/persistent-postgresql/test/ArrayAggTest.hs
@@ -6,6 +6,7 @@
 {-# LANGUAGE QuasiQuotes #-}
 {-# LANGUAGE TemplateHaskell #-}
 {-# LANGUAGE TypeFamilies #-}
+{-# LANGUAGE TypeOperators #-}
 {-# LANGUAGE UndecidableInstances #-} -- FIXME
 {-# LANGUAGE StandaloneDeriving #-}
 {-# LANGUAGE DerivingStrategies #-}
diff --git a/persistent-postgresql/test/EquivalentTypeTestPostgres.hs b/persistent-postgresql/test/EquivalentTypeTestPostgres.hs
index b23c3606a..1e1650bf7 100644
--- a/persistent-postgresql/test/EquivalentTypeTestPostgres.hs
+++ b/persistent-postgresql/test/EquivalentTypeTestPostgres.hs
@@ -9,6 +9,7 @@
 {-# LANGUAGE UndecidableInstances #-}
 {-# LANGUAGE DerivingStrategies #-}
 {-# LANGUAGE StandaloneDeriving #-}
+{-# LANGUAGE TypeOperators #-}
 {-# OPTIONS_GHC -Wno-unused-top-binds #-}
 
 module EquivalentTypeTestPostgres (specs) where
diff --git a/persistent-postgresql/test/ImplicitUuidSpec.hs b/persistent-postgresql/test/ImplicitUuidSpec.hs
index 68f5fd587..f0dbd361a 100644
--- a/persistent-postgresql/test/ImplicitUuidSpec.hs
+++ b/persistent-postgresql/test/ImplicitUuidSpec.hs
@@ -10,6 +10,7 @@
 {-# LANGUAGE TemplateHaskell #-}
 {-# LANGUAGE TypeApplications #-}
 {-# LANGUAGE TypeFamilies #-}
+{-# LANGUAGE TypeOperators #-}
 {-# LANGUAGE UndecidableInstances #-}
 
 module ImplicitUuidSpec where
diff --git a/persistent-postgresql/test/PgIntervalTest.hs b/persistent-postgresql/test/PgIntervalTest.hs
index 626d386fb..18ed2e516 100644
--- a/persistent-postgresql/test/PgIntervalTest.hs
+++ b/persistent-postgresql/test/PgIntervalTest.hs
@@ -11,6 +11,7 @@
 {-# LANGUAGE DerivingStrategies         #-}
 {-# LANGUAGE StandaloneDeriving         #-}
 {-# LANGUAGE DeriveAnyClass             #-}
+{-# LANGUAGE TypeOperators              #-}
 
 module PgIntervalTest where
 
diff --git a/persistent-postgresql/test/UpsertWhere.hs b/persistent-postgresql/test/UpsertWhere.hs
index 433fac1e0..3c74a5843 100644
--- a/persistent-postgresql/test/UpsertWhere.hs
+++ b/persistent-postgresql/test/UpsertWhere.hs
@@ -10,6 +10,7 @@
 {-# LANGUAGE TemplateHaskell #-}
 {-# LANGUAGE TypeApplications #-}
 {-# LANGUAGE TypeFamilies #-}
+{-# LANGUAGE TypeOperators #-}
 {-# LANGUAGE UndecidableInstances #-}
 
 module UpsertWhere where
diff --git a/persistent-postgresql/test/main.hs b/persistent-postgresql/test/main.hs
index c00650ac0..10a726623 100644
--- a/persistent-postgresql/test/main.hs
+++ b/persistent-postgresql/test/main.hs
@@ -9,6 +9,7 @@
 {-# LANGUAGE StandaloneDeriving #-}
 {-# LANGUAGE TemplateHaskell #-}
 {-# LANGUAGE TypeFamilies #-}
+{-# LANGUAGE TypeOperators #-}
 {-# LANGUAGE UndecidableInstances #-}
 {-# OPTIONS_GHC -Wno-unused-top-binds #-}
 
diff --git a/persistent-sqlite/test/main.hs b/persistent-sqlite/test/main.hs
index f8a7a87ea..96234efcd 100644
--- a/persistent-sqlite/test/main.hs
+++ b/persistent-sqlite/test/main.hs
@@ -12,6 +12,7 @@
 {-# LANGUAGE StandaloneDeriving #-}
 {-# LANGUAGE TemplateHaskell #-}
 {-# LANGUAGE TypeFamilies #-}
+{-# LANGUAGE TypeOperators #-}
 {-# LANGUAGE UndecidableInstances #-}
 {-# OPTIONS_GHC -fno-warn-unused-top-binds #-}