diff --git a/pkgs/development/libraries/haskell/transformers-compat/0.3.3.nix b/pkgs/development/libraries/haskell/transformers-compat/0.3.3.nix
deleted file mode 100644
index 4ff5df9d1c54..000000000000
--- a/pkgs/development/libraries/haskell/transformers-compat/0.3.3.nix
+++ /dev/null
@@ -1,17 +0,0 @@
-# This file was auto-generated by cabal2nix. Please do NOT edit manually!
-
-{ cabal, transformers }:
-
-cabal.mkDerivation (self: {
-  pname = "transformers-compat";
-  version = "0.3.3";
-  sha256 = "14lmwqr6q79k1f7byvb0jcm4r7lprhxkl85z72pr6ghn7bsvqwps";
-  buildDepends = [ transformers ];
-  meta = {
-    homepage = "http://github.com/ekmett/transformers-compat/";
-    description = "A small compatibility shim exposing the new types from transformers 0.3 and 0.4 to older Haskell platforms.";
-    license = self.stdenv.lib.licenses.bsd3;
-    platforms = self.ghc.meta.platforms;
-    hydraPlatforms = self.stdenv.lib.platforms.none;
-  };
-})
diff --git a/pkgs/development/libraries/haskell/transformers-compat/0.3.3.4.nix b/pkgs/development/libraries/haskell/transformers-compat/default.nix
similarity index 100%
rename from pkgs/development/libraries/haskell/transformers-compat/0.3.3.4.nix
rename to pkgs/development/libraries/haskell/transformers-compat/default.nix
diff --git a/pkgs/top-level/haskell-defaults.nix b/pkgs/top-level/haskell-defaults.nix
index 74e4b19ea62b..4e3746d4de6e 100644
--- a/pkgs/top-level/haskell-defaults.nix
+++ b/pkgs/top-level/haskell-defaults.nix
@@ -17,7 +17,6 @@
   ghcHEADPrefs = self : super : super // {
     cabalInstall_1_20_0_4 = super.cabalInstall_1_20_0_4.override { Cabal = null; };
     mtl = self.mtl_2_2_1;
-    transformersCompat = super.transformersCompat_0_3_3;
   };
 
   ghc783Prefs = self : super : ghcHEADPrefs self super // {
@@ -26,6 +25,9 @@
     jailbreakCabal = super.jailbreakCabal.override { Cabal = self.Cabal_1_20_0_2; };
     MonadRandom = self.MonadRandom_0_2_0_1; # newer versions require transformers >= 0.4.x
     mtl = self.mtl_2_1_3_1;
+    transformersCompat = super.transformersCompat.override { cabal = self.cabal.override {
+      extension = self: super: { configureFlags = "-fthree " + super.configureFlags or ""; };
+    }; };
   };
 
   ghc763Prefs = self : super : ghc783Prefs self super // {
diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index 8a3d0815e62f..7d3f59486cb7 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -2635,9 +2635,7 @@ self : let callPackage = x : y : modifyPrio (newScope self x y); in
 
   transformersBase = callPackage ../development/libraries/haskell/transformers-base {};
 
-  transformersCompat_0_3_3 = callPackage ../development/libraries/haskell/transformers-compat/0.3.3.nix {};
-  transformersCompat_0_3_3_4 = callPackage ../development/libraries/haskell/transformers-compat/0.3.3.4.nix {};
-  transformersCompat = self.transformersCompat_0_3_3_4;
+  transformersCompat = callPackage ../development/libraries/haskell/transformers-compat {};
 
   transformersFree = callPackage ../development/libraries/haskell/transformers-free {};