diff --git a/pkgs/development/libraries/haskell/IOSpec/default.nix b/pkgs/development/libraries/haskell/IOSpec/default.nix
new file mode 100644
index 00000000000..46211614c4c
--- /dev/null
+++ b/pkgs/development/libraries/haskell/IOSpec/default.nix
@@ -0,0 +1,13 @@
+{ cabal, mtl, QuickCheck, Stream }:
+
+cabal.mkDerivation (self: {
+  pname = "IOSpec";
+  version = "0.2.5";
+  sha256 = "0r6vqg39h6vzwlb33cvk72k4mh6jd8rpdcnkqsfxdqmsk7h8x84j";
+  buildDepends = [ mtl QuickCheck Stream ];
+  meta = {
+    description = "A pure specification of the IO monad";
+    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 8823445bbc5..e748d4400a0 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -932,6 +932,8 @@ let result = let callPackage = x : y : modifyPrio (newScope result.final x y);
 
   IORefCAS = callPackage ../development/libraries/haskell/IORefCAS {};
 
+  IOSpec = callPackage ../development/libraries/haskell/IOSpec {};
+
   ioStorage = callPackage ../development/libraries/haskell/io-storage {};
 
   irc = callPackage ../development/libraries/haskell/irc {