diff --git a/haskell/Main.hs b/haskell/Main.hs
index 2ca178b..f6a4f1e 100644
--- a/haskell/Main.hs
+++ b/haskell/Main.hs
@@ -30,7 +30,7 @@ tests :: TestTree IO ()
 tests =
     test "tests" pure $
         enumerate <&> \isRealData@(bool "examples" "real" -> t) ->
-            test (mkTestName $ T.pack t) pure $
+            test (T.pack t) pure $
                 [ Day1.puzzle
                 , Day2.puzzle
                 , Day3.puzzle
@@ -44,7 +44,7 @@ tests =
                 ]
                     <&> \Puzzle{number = show -> pt, parser, parts, extraTests} ->
                         testLazy
-                            (mkTestName $ T.pack pt)
+                            (T.pack pt)
                             ( \() -> do
                                 let fp = "../inputs/" <> t <> "/" <> pt
                                 input <-
@@ -58,7 +58,7 @@ tests =
                             )
                             $ ( finites <&> \(n@(show . succ @Int . fromIntegral -> nt)) ->
                                     test
-                                        (mkTestName $ T.pack nt)
+                                        (T.pack nt)
                                         (\(_, rs, _) -> golden ("../outputs/" <> t <> "/" <> pt <> "/" <> nt) $ rs n <> "\n")
                                         []
                               )
diff --git a/haskell/Pre.hs b/haskell/Pre.hs
index dbd0965..290188e 100644
--- a/haskell/Pre.hs
+++ b/haskell/Pre.hs
@@ -68,7 +68,6 @@ module Pre (
     test,
     testLazy,
     TestName,
-    mkTestName,
     getTestTree,
     displayTestResultsConsole,
     runTests,
@@ -266,14 +265,14 @@ newtype Test m a = Test (ExceptT TestFailure m a)
         )
 
 -- | See `testLazy` for avoiding the `NFData` constraint.
-test :: (NFData output) => TestName -> (input -> Test m output) -> [TestTree m output] -> TestTree m input
-test n f = TestTree n $ TestCase f
+test :: (NFData output) => Text -> (input -> Test m output) -> [TestTree m output] -> TestTree m input
+test n f = TestTree (TestName n) $ TestCase f
 
 {- | This is `test` without the `NFData` constraint.
 It doesn't force the output before completion, which means that reported timings may be less accurate.
 -}
-testLazy :: TestName -> (input -> Test m output) -> [TestTree m output] -> TestTree m input
-testLazy n f = TestTree n $ TestCaseLazy f
+testLazy :: Text -> (input -> Test m output) -> [TestTree m output] -> TestTree m input
+testLazy n f = TestTree (TestName n) $ TestCaseLazy f
 
 data TestResult
     = Pass TestName NominalDiffTime [TestResult]
@@ -289,9 +288,6 @@ data TestFailure
 newtype TestName = TestName Text
     deriving newtype (IsString, Show)
 
-mkTestName :: Text -> TestName
-mkTestName = TestName
-
 getTestTree :: TestTree m r -> Tree TestName
 getTestTree (TestTree name _ ts) = Node name $ map getTestTree ts
 
diff --git a/haskell/Puzzles/Day4.hs b/haskell/Puzzles/Day4.hs
index 8681a90..fbad03d 100644
--- a/haskell/Puzzles/Day4.hs
+++ b/haskell/Puzzles/Day4.hs
@@ -41,7 +41,7 @@ puzzle =
                  in map
                         ( \n ->
                             test
-                                (mkTestName $ T.show n)
+                                (T.show n)
                                 ( \frames -> do
                                     g <- lookupFrame n frames
                                     golden (path <> "frames/" <> show n) $ drawGrid g