diff --git a/pkgs/development/libraries/haskell/unlambda/default.nix b/pkgs/development/libraries/haskell/unlambda/default.nix
new file mode 100644
index 00000000000..4bdc1183586
--- /dev/null
+++ b/pkgs/development/libraries/haskell/unlambda/default.nix
@@ -0,0 +1,15 @@
+{ cabal, mtl }:
+
+cabal.mkDerivation (self: {
+  pname = "unlambda";
+  version = "0.1";
+  sha256 = "0xmn5w5vza6z2i3fs2hv2jgmb1lyk918viknsx3lk36i1dbyivgi";
+  isLibrary = true;
+  isExecutable = true;
+  buildDepends = [ mtl ];
+  meta = {
+    description = "Unlambda interpreter";
+    license = "GPL";
+    platforms = self.ghc.meta.platforms;
+  };
+})
diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index 975871ec412..e6c01fa40f9 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -1471,6 +1471,8 @@ let result = let callPackage = x : y : modifyPrio (newScope result.final x y);
 
   unixCompat = callPackage ../development/libraries/haskell/unix-compat {};
 
+  unlambda = callPackage ../development/libraries/haskell/unlambda {};
+
   unorderedContainers = callPackage ../development/libraries/haskell/unordered-containers {};
 
   url = callPackage ../development/libraries/haskell/url {};