diff --git a/pkgs/development/haskell-modules/configuration-nix.nix b/pkgs/development/haskell-modules/configuration-nix.nix
index c0ca0d8a7ca1..d01203e5ea36 100644
--- a/pkgs/development/haskell-modules/configuration-nix.nix
+++ b/pkgs/development/haskell-modules/configuration-nix.nix
@@ -900,4 +900,6 @@ self: super: builtins.intersectAttrs super {
       '';
     }));
 
+  rel8 = addTestToolDepend super.rel8 pkgs.postgresql;
+
 }