diff --git a/flake.nix b/flake.nix
index 04920402bc7831d9d136cd1d46338fd018a3cb42..22e13aeb84acda5ce3a3901741acdad4daa59008 100644
--- a/flake.nix
+++ b/flake.nix
@@ -83,7 +83,7 @@
               # headers and stuff.
               export PKG_CONFIG_PATH=${pkgs.lib.makeSearchPath "lib/pkgconfig" [pkgs.zlib.dev]}
 
-              ghc-pkg check -v -v
+              ghc-pkg check --package-db $CI_PROJECT_DIR/.cabal/store/ghc-8.10.7/package.db
               cabal update hackage.haskell.org
               cabal run tests
             '';