diff --git a/pkgs/development/libraries/haskell/mtl/1.1.0.2.nix b/pkgs/development/libraries/haskell/mtl/1.1.0.2.nix
deleted file mode 100644
index 3cc240114dfe..000000000000
--- a/pkgs/development/libraries/haskell/mtl/1.1.0.2.nix
+++ /dev/null
@@ -1,15 +0,0 @@
-# This file was auto-generated by cabal2nix. Please do NOT edit manually!
-
-{ cabal }:
-
-cabal.mkDerivation (self: {
-  pname = "mtl";
-  version = "1.1.0.2";
-  sha256 = "a225aaf2b1e337f40c31e5c42f95eec9a4608322b0e4c135d2b31b8421a58d36";
-  meta = {
-    description = "Monad transformer library";
-    license = self.stdenv.lib.licenses.bsd3;
-    platforms = self.ghc.meta.platforms;
-    hydraPlatforms = self.stdenv.lib.platforms.none;
-  };
-})
diff --git a/pkgs/development/libraries/haskell/mtl/2.0.1.0.nix b/pkgs/development/libraries/haskell/mtl/2.0.1.0.nix
deleted file mode 100644
index e528736d95a7..000000000000
--- a/pkgs/development/libraries/haskell/mtl/2.0.1.0.nix
+++ /dev/null
@@ -1,16 +0,0 @@
-# This file was auto-generated by cabal2nix. Please do NOT edit manually!
-
-{ cabal, transformers }:
-
-cabal.mkDerivation (self: {
-  pname = "mtl";
-  version = "2.0.1.0";
-  sha256 = "1w6jpzyl08mringnd6gxwcl3y9q506r240vm1sv0aacml1hy8szk";
-  buildDepends = [ transformers ];
-  meta = {
-    description = "Monad classes, using functional dependencies";
-    license = self.stdenv.lib.licenses.bsd3;
-    platforms = self.ghc.meta.platforms;
-    hydraPlatforms = self.stdenv.lib.platforms.none;
-  };
-})
diff --git a/pkgs/development/libraries/haskell/mtl/2.1.1.nix b/pkgs/development/libraries/haskell/mtl/2.1.1.nix
deleted file mode 100644
index 8cfb60ddfefd..000000000000
--- a/pkgs/development/libraries/haskell/mtl/2.1.1.nix
+++ /dev/null
@@ -1,16 +0,0 @@
-# This file was auto-generated by cabal2nix. Please do NOT edit manually!
-
-{ cabal, transformers }:
-
-cabal.mkDerivation (self: {
-  pname = "mtl";
-  version = "2.1.1";
-  sha256 = "143s0c5hygwnd72x14jwinpnd92gx4y9blhmv6086rxijqbq6l4j";
-  buildDepends = [ transformers ];
-  meta = {
-    description = "Monad classes, using functional dependencies";
-    license = self.stdenv.lib.licenses.bsd3;
-    platforms = self.ghc.meta.platforms;
-    hydraPlatforms = self.stdenv.lib.platforms.none;
-  };
-})
diff --git a/pkgs/development/libraries/haskell/mtl/2.1.2.nix b/pkgs/development/libraries/haskell/mtl/2.1.2.nix
deleted file mode 100644
index d72f8bc79d62..000000000000
--- a/pkgs/development/libraries/haskell/mtl/2.1.2.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 = "mtl";
-  version = "2.1.2";
-  sha256 = "1vwb98ci3jnjpndym012amia41h3cjdwpy9330ws881l6dj5fxwc";
-  buildDepends = [ transformers ];
-  meta = {
-    homepage = "http://github.com/ekmett/mtl";
-    description = "Monad classes, using functional dependencies";
-    license = self.stdenv.lib.licenses.bsd3;
-    platforms = self.ghc.meta.platforms;
-    hydraPlatforms = self.stdenv.lib.platforms.none;
-  };
-})
diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index 633742f463ea..407023683f27 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -1695,10 +1695,6 @@ self : let callPackage = x : y : modifyPrio (newScope self x y); in
 
   msgpack = callPackage ../development/libraries/haskell/msgpack {};
 
-  mtl_1_1_0_2 = callPackage ../development/libraries/haskell/mtl/1.1.0.2.nix {};
-  mtl_2_0_1_0 = callPackage ../development/libraries/haskell/mtl/2.0.1.0.nix {};
-  mtl_2_1_1 = callPackage ../development/libraries/haskell/mtl/2.1.1.nix {};
-  mtl_2_1_2 = callPackage ../development/libraries/haskell/mtl/2.1.2.nix {};
   mtl_2_1_3_1 = callPackage ../development/libraries/haskell/mtl/2.1.3.1.nix {};
   mtl_2_2_1 = callPackage ../development/libraries/haskell/mtl/2.2.1.nix {};
   mtl = null; # tightly coupled with 'transformers' which is a core package