diff --git a/pkgs/development/tools/parsing/alex/3.0.1.nix b/pkgs/development/tools/parsing/alex/3.0.1.nix
new file mode 100644
index 000000000000..90d6df1a50a9
--- /dev/null
+++ b/pkgs/development/tools/parsing/alex/3.0.1.nix
@@ -0,0 +1,16 @@
+{ cabal, QuickCheck, perl }:
+
+cabal.mkDerivation (self: {
+  pname = "alex";
+  version = "3.0.1";
+  sha256 = "1w7s9kzgr4kfh6cyhb4qkvxwy9gcw3xa1d2k5dy575k3wk73awkj";
+  isLibrary = false;
+  isExecutable = true;
+  buildDepends = [ QuickCheck ];
+  buildTools = [ perl ];
+  meta = {
+    homepage = "http://www.haskell.org/alex/";
+    description = "Alex is a tool for generating lexical analysers in Haskell";
+    license = self.stdenv.lib.licenses.bsd3;
+  };
+})
diff --git a/pkgs/development/tools/parsing/alex/3.0.nix b/pkgs/development/tools/parsing/alex/3.0.nix
deleted file mode 100644
index b071036293af..000000000000
--- a/pkgs/development/tools/parsing/alex/3.0.nix
+++ /dev/null
@@ -1,12 +0,0 @@
-{cabal, perl, QuickCheck2}:
-
-cabal.mkDerivation (self : {
-  pname = "alex";
-  version = "3.0"; # Haskell Platform future?
-  name = self.fname;
-  sha256 = "0vjm58xb64lvhd7h3cfgrm81630pl2avz6v98323s6i9jsizi8js";
-  extraBuildInputs = [perl QuickCheck2];
-  meta = {
-    description = "A lexical analyser generator for Haskell";
-  };
-})
diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index 3cc224eb0d6d..6165aadd4dd2 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -148,7 +148,7 @@ let result = let callPackage = x : y : modifyPrio (newScope result.final x y);
     mtl          = self.mtl_2_0_1_0; # 7.2 ok, 7.3 ok
     random       = self.random_1_0_0_3; # 7.2 ok, 7.3 ok
     cabalInstall = self.cabalInstall_0_10_2; # 7.2 fails, 7.3 fails
-    alex         = self.alex_3_0; # 7.2 ok, 7.3 ok
+    alex         = self.alex_3_0_1; # 7.2 ok, 7.3 ok
     happy        = self.happy_1_18_6; # 7.2 ok, 7.3 ok
     haddock      = self.haddock_2_9_2; # 7.2 fails, 7.3 fails
   };
@@ -1365,7 +1365,7 @@ let result = let callPackage = x : y : modifyPrio (newScope result.final x y);
   alex_2_3_2 = callPackage ../development/tools/parsing/alex/2.3.2.nix {};
   alex_2_3_3 = callPackage ../development/tools/parsing/alex/2.3.3.nix {};
   alex_2_3_5 = callPackage ../development/tools/parsing/alex/2.3.5.nix {};
-  alex_3_0   = callPackage ../development/tools/parsing/alex/3.0.nix   {};
+  alex_3_0_1 = callPackage ../development/tools/parsing/alex/3.0.1.nix {};
   alex = self.alex_2_3_1;
 
   alexMeta = callPackage ../development/tools/haskell/alex-meta {};