diff --git a/pkgs/development/compilers/uhc/default.nix b/pkgs/development/compilers/uhc/default.nix
index 0d91ca2ff3b2..93aa7811449a 100644
--- a/pkgs/development/compilers/uhc/default.nix
+++ b/pkgs/development/compilers/uhc/default.nix
@@ -1,3 +1,8 @@
+# Note: The Haskell package set used for building UHC is
+# determined in the file top-level/haskell-packages.nix.
+# We are using Stackage LTS to avoid constant breakage.
+# Bump the Stackage LTS release to the last release if possible
+# when a new UHC version is released.
 { stdenv, coreutils, fetchgit, m4, libtool, clang, ghcWithPackages }:
 
 let wrappedGhc = ghcWithPackages (hpkgs: with hpkgs; [fgl vector syb uulib network binary hashable uhc-util mtl transformers directory containers array process filepath shuffle uuagc] );
@@ -50,8 +55,10 @@ in stdenv.mkDerivation rec {
     # On Darwin, the GNU libtool is used, which does not
     # support the -static flag and thus breaks the build.
     platforms = ["x86_64-linux"];
-
-    broken = true;  # https://github.com/UU-ComputerScience/uhc/issues/69
+    # Hydra currently doesn't build the Stackage LTS package set,
+    # and we don't want to build all our haskell dependencies
+    # from scratch just to build UHC.
+    hydraPlatforms = stdenv.lib.platforms.none;
 
   };
 }
diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index a802623df8e9..14bb80ebf04d 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -60,7 +60,10 @@ rec {
 
     uhc = callPackage ../development/compilers/uhc/default.nix ({
       stdenv = pkgs.clangStdenv;
-      inherit (pkgs.haskellPackages) ghcWithPackages;
+      # UHC 1.1.9.2 is incompatible with hashable 1.2.4.0,
+      # latest LTS with a compatible hashable is LTS 4.1
+      # See also https://github.com/UU-ComputerScience/uhc/issues/69
+      inherit (pkgs.haskell.packages.lts-4_1) ghcWithPackages;
     });
 
   };