diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,10 @@
 # Changelog for persistent-postgresql
 
+## 2.13.5.1
+
+* [#1459](https://github.com/yesodweb/persistent/pull/1459)
+    * Make use of `CautiousMigration` type alias for clarity.
+
 ## 2.13.5.0
 
 * [#1362](https://github.com/yesodweb/persistent/pull/1362/)
diff --git a/Database/Persist/Postgresql.hs b/Database/Persist/Postgresql.hs
--- a/Database/Persist/Postgresql.hs
+++ b/Database/Persist/Postgresql.hs
@@ -612,7 +612,7 @@
 migrate' :: [EntityDef]
          -> (Text -> IO Statement)
          -> EntityDef
-         -> IO (Either [Text] [(Bool, Text)])
+         -> IO (Either [Text] CautiousMigration)
 migrate' allDefs getter entity = fmap (fmap $ map showAlterDb) $ do
     old <- getColumns getter entity newcols'
     case partitionEithers old of
diff --git a/persistent-postgresql.cabal b/persistent-postgresql.cabal
--- a/persistent-postgresql.cabal
+++ b/persistent-postgresql.cabal
@@ -1,5 +1,5 @@
 name:            persistent-postgresql
-version:         2.13.5.0
+version:         2.13.5.1
 license:         MIT
 license-file:    LICENSE
 author:          Felipe Lessa, Michael Snoyman <michael@snoyman.com>
diff --git a/test/PgInit.hs b/test/PgInit.hs
--- a/test/PgInit.hs
+++ b/test/PgInit.hs
@@ -48,6 +48,7 @@
        , MonadFail
        , RunDb
        , TestFn(..)
+       , UUID(..)
        , arbText
        , asIO
        , assertEmpty
@@ -55,35 +56,35 @@
        , assertNotEqual
        , isTravis
        , liftA2
+       , sqlSettingsUuid
        , truncateTimeOfDay
        , truncateToMicro
        , truncateUTCTime
        , (==@)
        , (@/=)
        , (@==)
-       , UUID(..)
-       , sqlSettingsUuid
        )
 
 -- re-exports
 import Control.Exception (SomeException)
 import Control.Monad (forM_, liftM, replicateM, void, when)
 import Control.Monad.Trans.Reader
-import Data.Aeson (ToJSON, FromJSON, Value(..), object)
+import Data.Aeson (FromJSON, ToJSON, Value(..), object)
+import qualified Data.Text.Encoding as TE
 import Database.Persist.Postgresql.JSON ()
 import Database.Persist.Sql.Raw.QQ
 import Database.Persist.SqlBackend
 import Database.Persist.TH
        ( MkPersistSettings(..)
-       , mkMigrate
        , migrateModels
+       , mkEntityDefList
+       , mkMigrate
        , mkPersist
        , persistLowerCase
        , persistUpperCase
+       , setImplicitIdDef
        , share
        , sqlSettings
-       , setImplicitIdDef
-       , mkEntityDefList
        )
 import Test.Hspec
        ( Arg
@@ -102,7 +103,6 @@
 import Test.Hspec.Expectations.Lifted
 import Test.QuickCheck.Instances ()
 import UnliftIO
-import qualified Data.Text.Encoding as TE
 
 -- testing
 import Test.HUnit (Assertion, assertBool, assertFailure, (@=?), (@?=))
diff --git a/test/main.hs b/test/main.hs
--- a/test/main.hs
+++ b/test/main.hs
@@ -58,6 +58,7 @@
 import qualified SumTypeTest
 import qualified TransactionLevelTest
 import qualified TreeTest
+import qualified TypeLitFieldDefsTest
 import qualified UniqueTest
 import qualified UpsertTest
 import qualified UpsertWhere
@@ -121,6 +122,7 @@
       , UniqueTest.uniqueMigrate
       , MaxLenTest.maxlenMigrate
       , MaybeFieldDefsTest.maybeFieldDefMigrate
+      , TypeLitFieldDefsTest.typeLitFieldDefsMigrate
       , Recursive.recursiveMigrate
       , CompositeTest.compositeMigrate
       , TreeTest.treeMigrate
@@ -174,6 +176,7 @@
       UniqueTest.specsWith runConnAssert
       MaxLenTest.specsWith runConnAssert
       MaybeFieldDefsTest.specsWith runConnAssert
+      TypeLitFieldDefsTest.specsWith runConnAssert
       Recursive.specsWith runConnAssert
       SumTypeTest.specsWith runConnAssert (Just (runMigrationSilent SumTypeTest.sumTypeMigrate))
       MigrationTest.specsWith runConnAssert