diff --git a/pkgs/development/libraries/haskell/parsers/0.10.3.nix b/pkgs/development/libraries/haskell/parsers/0.10.3.nix
deleted file mode 100644
index 1da7380f252..00000000000
--- a/pkgs/development/libraries/haskell/parsers/0.10.3.nix
+++ /dev/null
@@ -1,22 +0,0 @@
-# This file was auto-generated by cabal2nix. Please do NOT edit manually!
-
-{ cabal, charset, doctest, filepath, parsec, text, transformers
-, unorderedContainers
-}:
-
-cabal.mkDerivation (self: {
-  pname = "parsers";
-  version = "0.10.3";
-  sha256 = "1s9n59q77h0w1csq7yh945b53847a9hnpvviashgxyi7ahvw7jli";
-  buildDepends = [
-    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;
-    hydraPlatforms = self.stdenv.lib.platforms.none;
-  };
-})
diff --git a/pkgs/development/libraries/haskell/parsers/0.12.1.nix b/pkgs/development/libraries/haskell/parsers/default.nix
similarity index 100%
rename from pkgs/development/libraries/haskell/parsers/0.12.1.nix
rename to pkgs/development/libraries/haskell/parsers/default.nix
diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index 6954fabee6d..a2340779a9b 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -1817,9 +1817,7 @@ self : let callPackage = x : y : modifyPrio (newScope self x y); in
   parsec_3_1_5   = callPackage ../development/libraries/haskell/parsec/3.1.5.nix {};
   parsec = self.parsec_3_1_5;
 
-  parsers_0_10_3 = callPackage ../development/libraries/haskell/parsers/0.10.3.nix {};
-  parsers_0_12_1 = callPackage ../development/libraries/haskell/parsers/0.12.1.nix {};
-  parsers = self.parsers_0_12_1;
+  parsers = callPackage ../development/libraries/haskell/parsers {};
 
   parsimony = callPackage ../development/libraries/haskell/parsimony {};