diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index 1125b8b9d9f..95d8ede8f09 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -415,7 +415,13 @@ rec {
     lts-6_3 = packages.ghc7103.override {
       packageSetConfig = callPackage ../development/haskell-modules/configuration-lts-6.3.nix { };
     };
-    lts-6 = packages.lts-6_3;
+    lts-6_4 = packages.ghc7103.override {
+      packageSetConfig = callPackage ../development/haskell-modules/configuration-lts-6.4.nix { };
+    };
+    lts-6_5 = packages.ghc7103.override {
+      packageSetConfig = callPackage ../development/haskell-modules/configuration-lts-6.5.nix { };
+    };
+    lts-6 = packages.lts-6_5;
 
     lts = packages.lts-6;
   };