diff --git a/pkgs/development/haskell-modules/configuration-ghc-8.0.x.nix b/pkgs/development/haskell-modules/configuration-ghc-8.0.x.nix index f0b793d949d..2c5b00625f8 100644 --- a/pkgs/development/haskell-modules/configuration-ghc-8.0.x.nix +++ b/pkgs/development/haskell-modules/configuration-ghc-8.0.x.nix @@ -68,4 +68,7 @@ self: super: { # Version 4.x doesn't compile with transformers 0.5 or later. kan-extensions = self.kan-extensions_5_0_1; + # Earlier versions don't support kan-extensions 5.x. + lens = self.lens_4_13_2_1; + }