diff --git a/flake.nix b/flake.nix
index f04e767..a5480e5 100644
--- a/flake.nix
+++ b/flake.nix
@@ -7,7 +7,14 @@
   outputs = { self, nixpkgs, flake-utils }: flake-utils.lib.eachDefaultSystem (system:
     let
       pkgs = import nixpkgs { inherit system; };
-      opium = pkgs.haskellPackages.developPackage {
+    in {
+      packages.opium = pkgs.haskell.lib.overrideCabal (pkgs.haskellPackages.developPackage { root = ./.; }) {
+        # Currently the tests require a running Postgres instance.
+        # This is not automated yet, so don't export the tests.
+        doCheck = false;
+      };
+
+      devShells.default = (pkgs.haskellPackages.developPackage {
         root = ./.;
         modifier = drv:
           pkgs.haskell.lib.addBuildTools drv [
@@ -15,15 +22,7 @@
             pkgs.haskellPackages.implicit-hie
             pkgs.haskell-language-server
           ];
-      };
-    in {
-      packages.opium = pkgs.haskell.lib.overrideCabal opium {
-        # Currently the tests require a running Postgres instance.
-        # This is not automated yet, so don't export the tests.
-        doCheck = false;
-      };
-
-      devShells.default = opium.env;
+      }).env;
     }
   );
 }