diff --git a/pkgs/development/libraries/haskell/parsers/0.11.0.3.nix b/pkgs/development/libraries/haskell/parsers/0.11.0.3.nix
deleted file mode 100644
index 42f51f00659c..000000000000
--- a/pkgs/development/libraries/haskell/parsers/0.11.0.3.nix
+++ /dev/null
@@ -1,21 +0,0 @@
-# This file was auto-generated by cabal2nix. Please do NOT edit manually!
-
-{ cabal, attoparsec, charset, doctest, filepath, parsec, text
-, transformers, unorderedContainers
-}:
-
-cabal.mkDerivation (self: {
-  pname = "parsers";
-  version = "0.11.0.3";
-  sha256 = "0cwjzk76i7isg7h1xl9iv6x87vfw3x2x5jaacx85g8v45lv7g88s";
-  buildDepends = [
-    attoparsec charset parsec text transformers unorderedContainers
-  ];
-  testDepends = [ doctest filepath ];
-  meta = {
-    homepage = "http://github.com/ekmett/parsers/";
-    description = "Parsing combinators";
-    license = self.stdenv.lib.licenses.bsd3;
-    platforms = self.ghc.meta.platforms;
-  };
-})
diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index b10ec37efbf9..65ce51591185 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -1745,9 +1745,8 @@ self : let callPackage = x : y : modifyPrio (newScope self x y); in
   parsec = self.parsec_3_1_5;
 
   parsers_0_10_3 = callPackage ../development/libraries/haskell/parsers/0.10.3.nix {};
-  parsers_0_11_0_3 = callPackage ../development/libraries/haskell/parsers/0.11.0.3.nix {};
   parsers_0_12 = callPackage ../development/libraries/haskell/parsers/0.12.nix {};
-  parsers = self.parsers_0_11_0_3; # the new version breaks trifecta
+  parsers = self.parsers_0_12;
 
   parsimony = callPackage ../development/libraries/haskell/parsimony {};