diff --git a/flake.nix b/flake.nix
index d11337e1c92f8a288b21261f9f365366ace8c245..6717b408f78c29e43c24a1f30411fc3dc8ea4d27 100644
--- a/flake.nix
+++ b/flake.nix
@@ -83,6 +83,7 @@
               # headers and stuff.
               export PKG_CONFIG_PATH=${pkgs.lib.makeSearchPath "lib/pkgconfig" [pkgs.zlib.dev]}
 
+              find
               ghc-pkg check --package-db .cabal/store/ghc-8.10.7/package.db
               cabal update hackage.haskell.org
               cabal run tests