diff --git a/pkgs/development/compilers/mlton/default.nix b/pkgs/development/compilers/mlton/default.nix
index b32a817e20a..aaf58885140 100644
--- a/pkgs/development/compilers/mlton/default.nix
+++ b/pkgs/development/compilers/mlton/default.nix
@@ -15,4 +15,12 @@ rec {
     sha256 = "00rdd2di5x1dzac64il9z05m3fdzicjd3226wwjyynv631jj3q2a";
     inherit stdenv fetchgit gmp;
   };
+
+  mltonHEAD = import ./from-git-source.nix {
+    mltonBootstrap = mlton20180207Binary;
+    version = "HEAD";
+    rev = "e149c9917cfbfe6aba5c986a958ed76d5cc6cfde";
+    sha256 = "0a0j1i0f0fxw2my1309srq5j3vz0kawrrln01gxms2m5hy5dl50d";
+    inherit stdenv fetchgit gmp;
+  };
 }
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index a221c194a24..011a42c3255 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -7165,9 +7165,10 @@ with pkgs;
   inherit (callPackage ../development/compilers/mlton {})
     mlton20130715
     mlton20180207Binary
-    mlton20180207;
+    mlton20180207
+    mltonHEAD;
 
-  mlton = mlton20130715;
+  mlton = mlton20180207;
 
   mono  = mono5;
   mono5 = mono58;