diff --git a/test/Bench.hs b/test/Bench.hs
index 0ae3856..14bd2f0 100644
--- a/test/Bench.hs
+++ b/test/Bench.hs
@@ -1,11 +1,23 @@
+-----------------------------------------------------------------------------
+-- |
+-- Copyright   :  (C) 2015 Anselm Jonas Scholl, (C) 2023 Julia Longtin
+-- License     :  BSD3
+-- Maintainer  :  Julia Longtin <Julia.Longtin@gmail.com>
+-- Stability   :  experimental
+-- Portability :  GHC-specific
+--
+
 module Main where
 
-import TestUtils
+import Prelude (Double, Float, IO, ($), (++), concatMap, map, shows, unzip)
+
+import TestUtils (refDoubleDown, refDoubleToWord, refDoubleUp, refDoubleUlp, refFloatDown, refFloatToWord, refFloatUp, refFloatUlp, refWordToDouble, refWordToFloat, showW, testD, testF)
+
+import Data.Word (Word32, Word64)
 
-import Data.Word
-import Data.Bits.Floating
+import Data.Bits.Floating (coerceToFloat, coerceToWord, nextDown, nextUp, ulp)
 
-import Criterion.Main
+import Criterion.Main (Benchmark, bench, bgroup, defaultMain, nf)
 
 mkSingleBenchmarks :: ((Float, Word32) -> [Benchmark]) -> ((Double, Word64) -> [Benchmark]) -> [Benchmark]
 mkSingleBenchmarks mkFTest mkDTest = concatMap mkFTest testF ++ concatMap mkDTest testD
diff --git a/test/TestUtils.hs b/test/TestUtils.hs
index f265e43..88dfb35 100644
--- a/test/TestUtils.hs
+++ b/test/TestUtils.hs
@@ -1,9 +1,21 @@
+-----------------------------------------------------------------------------
+-- |
+-- Copyright   :  (C) 2015 Anselm Jonas Scholl, (C) 2023 Julia Longtin
+-- License     :  BSD3
+-- Maintainer  :  Julia Longtin <Julia.Longtin@gmail.com>
+-- Stability   :  experimental
+-- Portability :  GHC-specific
+--
+
 {-# LANGUAGE ForeignFunctionInterface #-}
+
 module TestUtils where
 
-import Data.Word
+import Prelude (Double, Float, Integral, Show, String, (/), pi, sqrt)
+
+import Data.Word (Word32, Word64)
 
-import Numeric
+import Numeric (showHex)
 
 -- we do not test NaNs here because their binary representation can be changed
 -- without changing their value and some processors have been observed to do that.