diff --git a/pkgs/top-level/haskell-defaults.nix b/pkgs/top-level/haskell-defaults.nix
index a8f4110fdb3..708fe3271a6 100644
--- a/pkgs/top-level/haskell-defaults.nix
+++ b/pkgs/top-level/haskell-defaults.nix
@@ -104,6 +104,7 @@
     haddock = self.haddock_2_4_2;
     happy = super.happy.override { cabal = self.cabal.override { Cabal = self.Cabal_1_16_0_3; }; };
     hashable = super.hashable.override { cabal = self.cabal.override { Cabal = self.Cabal_1_16_0_3; }; };
+    hashtables = super.hashtables.override { cabal = self.cabal.override { Cabal = self.Cabal_1_16_0_3; }; };
     HTTP = super.HTTP.override { cabal = self.cabal.override { Cabal = self.Cabal_1_16_0_3; }; };
     HUnit = super.HUnit.override { cabal = self.cabal.override { Cabal = self.Cabal_1_16_0_3; }; };
     network = super.network.override { cabal = self.cabal.override { Cabal = self.Cabal_1_16_0_3; }; };