diff --git a/pkgs/development/compilers/elm/elm-reactor.nix b/pkgs/development/compilers/elm/elm-reactor.nix
new file mode 100644
index 000000000000..7b53d9190d8f
--- /dev/null
+++ b/pkgs/development/compilers/elm/elm-reactor.nix
@@ -0,0 +1,29 @@
+# This file was auto-generated by cabal2nix. Please do NOT edit manually!
+
+{ cabal, blazeHtml, blazeMarkup, cmdargs, Elm, fetchgit, filepath
+, fsnotify, HTTP, mtl, snapCore, snapServer, systemFilepath, time
+, transformers, unorderedContainers, websockets, websocketsSnap
+}:
+
+cabal.mkDerivation (self: {
+  pname = "elm-reactor";
+  version = "0.1";
+  src = fetchgit {
+    url = "git://github.com/elm-lang/elm-reactor.git";
+    sha256 = "1e45ef26a9b1c1748737dce071a7f2587d0d22643085942a98006f9b11d11dfe";
+    rev = "8715046c5bc8b18f0540069c1a9a65f3aa8332e1";
+  };
+  isLibrary = false;
+  isExecutable = true;
+  buildDepends = [
+    blazeHtml blazeMarkup cmdargs Elm filepath fsnotify HTTP mtl
+    snapCore snapServer systemFilepath time transformers
+    unorderedContainers websockets websocketsSnap
+  ];
+  meta = {
+    homepage = "http://elm-lang.org";
+    description = "Interactive development tool for Elm programs";
+    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 bbe770f8db23..890d95b21a82 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -754,6 +754,8 @@ self : let callPackage = x : y : modifyPrio (newScope self x y); in
 
   elmRepl = callPackage ../development/compilers/elm/elm-repl.nix {};
 
+  elmReactor = callPackage ../development/compilers/elm/elm-reactor.nix {};
+
   elmGet = callPackage ../development/compilers/elm/elm-get.nix {
     optparseApplicative = self.optparseApplicative_0_10_0;
   };