diff --git a/pkgs/development/haskell-modules/configuration-hackage2nix.yaml b/pkgs/development/haskell-modules/configuration-hackage2nix.yaml
index 52b1cd901d7..94812f568a8 100644
--- a/pkgs/development/haskell-modules/configuration-hackage2nix.yaml
+++ b/pkgs/development/haskell-modules/configuration-hackage2nix.yaml
@@ -2560,6 +2560,7 @@ extra-packages:
   - dbus <1                             # for xmonad-0.26
   - deepseq == 1.3.0.1                  # required to build Cabal with GHC 6.12.3
   - dhall == 1.29.0                     # required for spago 0.14.0.
+  - Diff < 0.4                          # required by liquidhaskell-0.8.10.2: https://github.com/ucsd-progsys/liquidhaskell/issues/1729
   - doctemplates == 0.8                 # required by pandoc-2.9.x
   - gi-gdk == 3.0.23                    # required for gi-pango 1.0.23
   - gi-gtk == 3.0.35                    # required for gi-pango 1.0.23