diff --git a/pkgs/development/libraries/haskell/async/2.0.1.3.nix b/pkgs/development/libraries/haskell/async/2.0.1.3.nix
deleted file mode 100644
index a60830309e78..000000000000
--- a/pkgs/development/libraries/haskell/async/2.0.1.3.nix
+++ /dev/null
@@ -1,19 +0,0 @@
-# This file was auto-generated by cabal2nix. Please do NOT edit manually!
-
-{ cabal, HUnit, stm, testFramework, testFrameworkHunit }:
-
-cabal.mkDerivation (self: {
-  pname = "async";
-  version = "2.0.1.3";
-  sha256 = "1rbjr6xw5sp8npw17fxg0942kikssv2hyci2sy26r0na98483mkh";
-  buildDepends = [ stm ];
-  testDepends = [ HUnit testFramework testFrameworkHunit ];
-  jailbreak = true;
-  meta = {
-    homepage = "https://github.com/simonmar/async";
-    description = "Run IO operations asynchronously and wait for their results";
-    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 391c6dce1512..1288f781b08b 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -189,7 +189,6 @@ self : let callPackage = x : y : modifyPrio (newScope self x y); in
 
   asn1Types = callPackage ../development/libraries/haskell/asn1-types {};
 
-  async_2_0_1_3 = callPackage ../development/libraries/haskell/async/2.0.1.3.nix {};
   async_2_0_1_4 = callPackage ../development/libraries/haskell/async/2.0.1.4.nix {};
   async_2_0_1_6 = callPackage ../development/libraries/haskell/async/2.0.1.6.nix {};
   async = self.async_2_0_1_6;