diff --git a/flake.nix b/flake.nix
index 963f54e..a6cb716 100644
--- a/flake.nix
+++ b/flake.nix
@@ -35,7 +35,6 @@
                 in ''
                   export GYEHOEK_RUNTIME=${lib.getExe final.gyehoek-runtime}
                   export PATH=${lib.makeBinPath bin}:$PATH
-                  export GYEHOEK_IN_NIX_BUILD=1
                 '';
             })];
             shell = {
diff --git a/gyehoek.cabal b/gyehoek.cabal
index b8f4b21..a29f415 100644
--- a/gyehoek.cabal
+++ b/gyehoek.cabal
@@ -156,11 +156,11 @@ test-suite test
   default-language:   GHC2024
 
 -- https://github.com/martijnbastiaan/doctest-parallel/pull/66
-test-suite doctest
-  import:         ghcstuffs, ghcstuffs-dev
-  type:           exitcode-stdio-1.0
-  hs-source-dirs: test
-  main-is:        doctest.hs
-  build-depends:
-    , base
-    , doctest-parallel  >=0.1
+-- test-suite doctest
+--   import:         ghcstuffs, ghcstuffs-dev
+--   type:           exitcode-stdio-1.0
+--   hs-source-dirs: test
+--   main-is:        doctest.hs
+--   build-depends:
+--     , base
+--     , doctest-parallel  >=0.1
diff --git a/test/doctest.hs b/test/doctest.hs
index 9534c91..625343f 100644
--- a/test/doctest.hs
+++ b/test/doctest.hs
@@ -7,11 +7,4 @@ import System.IO (stderr, hPutStrLn)
 
 
 main :: IO ()
-main = do
-  nix <- maybe False null <$> lookupEnv "GYEHOEK_IN_NIX_BUILD"
-  if nix then do
-    hPutStrLn stderr "\
-     \skipping doctests in Nix build environment. \
-     \see https://github.com/pcapriotti/optparse-applicative/pull/408."
-  else
-    mainFromCabal "gyehoek" =<< getArgs
+main = mainFromCabal "gyehoek" =<< getArgs