diff --git a/persistent-test/src/LargeNumberTest.hs b/persistent-test/src/LargeNumberTest.hs
index a59f29779..5fb94f806 100644
--- a/persistent-test/src/LargeNumberTest.hs
+++ b/persistent-test/src/LargeNumberTest.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE TypeIperators #-}
 {-# LANGUAGE UndecidableInstances #-}
 module LargeNumberTest where
 
diff --git a/persistent-test/src/LongIdentifierTest.hs b/persistent-test/src/LongIdentifierTest.hs
index 85a6abf22..f9c2fc089 100644
--- a/persistent-test/src/LongIdentifierTest.hs
+++ b/persistent-test/src/LongIdentifierTest.hs
@@ -9,6 +9,7 @@
 {-# LANGUAGE QuasiQuotes #-}
 {-# LANGUAGE TemplateHaskell #-}
 {-# LANGUAGE TypeFamilies #-}
+{-# LANGUAGE TypeOperators #-}
 {-# LANGUAGE UndecidableInstances #-}
 module LongIdentifierTest where
 
diff --git a/persistent-test/src/MaxLenTest.hs b/persistent-test/src/MaxLenTest.hs
index 917b12138..979efe8b2 100644
--- a/persistent-test/src/MaxLenTest.hs
+++ b/persistent-test/src/MaxLenTest.hs
@@ -1,4 +1,5 @@
 {-# LANGUAGE UndecidableInstances #-}
+{-# LANGUAGE TypeOperators #-}
 {-# OPTIONS_GHC -Wno-unused-top-binds #-}
 
 module MaxLenTest (specsWith, maxlenMigrate) where
diff --git a/persistent-test/src/MaybeFieldDefsTest.hs b/persistent-test/src/MaybeFieldDefsTest.hs
index 9242ba4b7..e4609081e 100644
--- a/persistent-test/src/MaybeFieldDefsTest.hs
+++ b/persistent-test/src/MaybeFieldDefsTest.hs
@@ -1,4 +1,5 @@
 {-# LANGUAGE DeriveAnyClass #-}
+{-# LANGUAGE TypeOperators #-}
 {-# LANGUAGE UndecidableInstances #-}
 {-# OPTIONS_GHC -Wno-unused-top-binds #-}
 
diff --git a/persistent-test/src/MigrationColumnLengthTest.hs b/persistent-test/src/MigrationColumnLengthTest.hs
index ac5ffed89..051646cd7 100644
--- a/persistent-test/src/MigrationColumnLengthTest.hs
+++ b/persistent-test/src/MigrationColumnLengthTest.hs
@@ -1,4 +1,5 @@
 {-# LANGUAGE GeneralizedNewtypeDeriving #-}
+{-# LANGUAGE TypeOperators #-}
 {-# LANGUAGE UndecidableInstances #-}
 module MigrationColumnLengthTest where
 
diff --git a/persistent-test/src/MigrationIdempotencyTest.hs b/persistent-test/src/MigrationIdempotencyTest.hs
index 17766e6d1..3f58d14e7 100644
--- a/persistent-test/src/MigrationIdempotencyTest.hs
+++ b/persistent-test/src/MigrationIdempotencyTest.hs
@@ -1,4 +1,5 @@
 {-# LANGUAGE GeneralizedNewtypeDeriving #-}
+{-# LANGUAGE TypeOperators #-}
 {-# LANGUAGE UndecidableInstances #-}
 module MigrationIdempotencyTest where
 
diff --git a/persistent-test/src/PersistentTestModelsImports.hs b/persistent-test/src/PersistentTestModelsImports.hs
index c364a09c0..94b9d3e1a 100644
--- a/persistent-test/src/PersistentTestModelsImports.hs
+++ b/persistent-test/src/PersistentTestModelsImports.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE TypeOperators #-}
 {-# language UndecidableInstances #-}
 
 -- | this just needs to compile