diff --git a/pkgs/development/haskell-modules/configuration-ghc-8.6.x.nix b/pkgs/development/haskell-modules/configuration-ghc-8.6.x.nix
index 455b2358da77..41b6177efef6 100644
--- a/pkgs/development/haskell-modules/configuration-ghc-8.6.x.nix
+++ b/pkgs/development/haskell-modules/configuration-ghc-8.6.x.nix
@@ -95,7 +95,11 @@ self: super: {
   # Newer versions don't compile.
   resolv = self.resolv_0_1_1_2;
 
-  # cabal2nix needs the latest version of Cabal.
-  cabal2nix = super.cabal2nix.overrideScope (self: super: { Cabal = self.Cabal_3_0_0_0; });
+  # cabal2nix needs the latest version of Cabal, and the one
+  # hackage-db uses must match, so take the latest
+  cabal2nix = super.cabal2nix.overrideScope (self: super: {
+    Cabal = self.Cabal_3_0_0_0;
+    hackage-db = self.hackage-db_2_1_0;
+  });
 
 }