diff --git a/pkgs/development/libraries/haskell/attoparsec/0.11.3.4.nix b/pkgs/development/libraries/haskell/attoparsec/0.11.3.4.nix
deleted file mode 100644
index e322f6de4ce..00000000000
--- a/pkgs/development/libraries/haskell/attoparsec/0.11.3.4.nix
+++ /dev/null
@@ -1,22 +0,0 @@
-# This file was auto-generated by cabal2nix. Please do NOT edit manually!
-
-{ cabal, deepseq, QuickCheck, scientific, testFramework
-, testFrameworkQuickcheck2, text
-}:
-
-cabal.mkDerivation (self: {
-  pname = "attoparsec";
-  version = "0.11.3.4";
-  sha256 = "1zahmkb0n7jz0di35x3r8s0xnfg1awqybh2x2zicxbwazl4f53hi";
-  buildDepends = [ deepseq scientific text ];
-  testDepends = [
-    QuickCheck testFramework testFrameworkQuickcheck2 text
-  ];
-  meta = {
-    homepage = "https://github.com/bos/attoparsec";
-    description = "Fast combinator parsing for bytestrings and text";
-    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 1288f781b08..1ba808eb787 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -201,7 +201,6 @@ self : let callPackage = x : y : modifyPrio (newScope self x y); in
 
   attoparsec_0_10_4_0 = callPackage ../development/libraries/haskell/attoparsec/0.10.4.0.nix {};
   attoparsec_0_11_3_1 = callPackage ../development/libraries/haskell/attoparsec/0.11.3.1.nix {};
-  attoparsec_0_11_3_4 = callPackage ../development/libraries/haskell/attoparsec/0.11.3.4.nix {};
   attoparsec_0_12_1_2 = callPackage ../development/libraries/haskell/attoparsec/0.12.1.2.nix {};
   attoparsec = self.attoparsec_0_12_1_2;