diff --git a/pkgs/development/haskell-modules/configuration-nix.nix b/pkgs/development/haskell-modules/configuration-nix.nix
index db35bc84c9cb..0379794a85e8 100644
--- a/pkgs/development/haskell-modules/configuration-nix.nix
+++ b/pkgs/development/haskell-modules/configuration-nix.nix
@@ -1089,9 +1089,15 @@ self: super: builtins.intersectAttrs super {
 
   hercules-ci-agent = super.hercules-ci-agent.override { nix = self.hercules-ci-cnix-store.passthru.nixPackage; };
   hercules-ci-cnix-expr = addTestToolDepend pkgs.git (super.hercules-ci-cnix-expr.override { nix = self.hercules-ci-cnix-store.passthru.nixPackage; });
-  hercules-ci-cnix-store = (super.hercules-ci-cnix-store.override { nix = self.hercules-ci-cnix-store.passthru.nixPackage; }).overrideAttrs (_: {
-    passthru.nixPackage = pkgs.nixVersions.nix_2_16;
-  });
+  hercules-ci-cnix-store = overrideCabal
+    (old: {
+      passthru = old.passthru or { } // {
+        nixPackage = pkgs.nixVersions.nix_2_16;
+      };
+    })
+    (super.hercules-ci-cnix-store.override {
+      nix = self.hercules-ci-cnix-store.passthru.nixPackage;
+    });
 
   # the testsuite fails because of not finding tsc without some help
   aeson-typescript = overrideCabal (drv: {