diff --git a/pkgs/development/libraries/haskell/mtl/2.1.3.1.nix b/pkgs/development/libraries/haskell/mtl/2.1.3.1.nix
new file mode 100644
index 00000000000..372c8706cc9
--- /dev/null
+++ b/pkgs/development/libraries/haskell/mtl/2.1.3.1.nix
@@ -0,0 +1,17 @@
+# This file was auto-generated by cabal2nix. Please do NOT edit manually!
+
+{ cabal, transformers }:
+
+cabal.mkDerivation (self: {
+  pname = "mtl";
+  version = "2.1.3.1";
+  sha256 = "1xpn2wjmqbh2cg1yssc6749xpgcqlrrg4iilwqgkcjgvaxlpdbvp";
+  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-defaults.nix b/pkgs/top-level/haskell-defaults.nix
index 5aed3e899b5..e62222bb4c9 100644
--- a/pkgs/top-level/haskell-defaults.nix
+++ b/pkgs/top-level/haskell-defaults.nix
@@ -24,7 +24,7 @@
     cabalInstall_1_20_0_3 = super.cabalInstall_1_20_0_3.override { Cabal = self.Cabal_1_20_0_2; };
     codex = super.codex.override { hackageDb = super.hackageDb.override { Cabal = self.Cabal_1_20_0_2; }; };
     MonadRandom = self.MonadRandom_0_1_13; # requires transformers >= 0.4.x
-    mtl = self.mtl_2_1_2;
+    mtl = self.mtl_2_1_3_1;
   };
 
   ghc763Prefs = self : super : ghc783Prefs self super // {
diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index fcbb195e6f1..a5520dd814d 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -1718,6 +1718,7 @@ self : let callPackage = x : y : modifyPrio (newScope self x y); in
   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